Remove various mentions of "open source" from docs (#20517)

Fixes DOC-14806

Summary of changes:

- Remove some references to "free, open source CockroachDB" in links to
  an old blog post

- Update various mentions of other products which we call "open source",
  and which may or may not in fact still _be_ open source, but for which
  we should not be in the business of adjudicating/maintaining that
  description in our docs, since it may change

NB. These changes are backported to all supported versions v24.1 and
later

Author: rmloveland

src/current/_includes/cockroachcloud/cdc/create-core-changefeed-avro.md

@@ -10,7 +10,7 @@ In this example, you'll set up a core changefeed for a single-node cluster that
     --background
     ~~~
 
-1. Download and extract the [Confluent Open Source platform](https://www.confluent.io/download/).
+1. Download and extract the [Confluent platform](https://www.confluent.io/download/).
 
 1. Move into the extracted `confluent-<version>` directory and start Confluent:
 

src/current/_includes/v24.3/cdc/create-sinkless-changefeed-avro.md

@@ -10,7 +10,7 @@ In this example, you'll set up a basic changefeed for a single-node cluster that
     --background
     ~~~
 
-1. Download and extract the [Confluent Open Source platform](https://www.confluent.io/download/).
+1. Download and extract the [Confluent platform](https://www.confluent.io/download/).
 
 1. Move into the extracted `confluent-<version>` directory and start Confluent:
 

src/current/_includes/v25.1/cdc/create-sinkless-changefeed-avro.md

@@ -10,7 +10,7 @@ In this example, you'll set up a basic changefeed for a single-node cluster that
     --background
     ~~~
 
-1. Download and extract the [Confluent Open Source platform](https://www.confluent.io/download/).
+1. Download and extract the [Confluent platform](https://www.confluent.io/download/).
 
 1. Move into the extracted `confluent-<version>` directory and start Confluent:
 

src/current/_includes/v25.3/cdc/create-sinkless-changefeed-avro.md

@@ -10,7 +10,7 @@ In this example, you'll set up a sinkless changefeed for a single-node cluster t
     --background
     ~~~
 
-1. Download and extract the [Confluent Open Source platform](https://www.confluent.io/download/).
+1. Download and extract the [Confluent platform](https://www.confluent.io/download/).
 
 1. Move into the extracted `confluent-<version>` directory and start Confluent:
 

src/current/_includes/v25.4/cdc/create-sinkless-changefeed-avro.md

@@ -10,7 +10,7 @@ In this example, you'll set up a sinkless changefeed for a single-node cluster t
     --background
     ~~~
 
-1. Download and extract the [Confluent Open Source platform](https://www.confluent.io/download/).
+1. Download and extract the [Confluent platform](https://www.confluent.io/download/).
 
 1. Move into the extracted `confluent-<version>` directory and start Confluent:
 

src/current/v24.1/architecture/glossary.md

@@ -176,7 +176,7 @@ An extension to the [PostgreSQL](https://postgresql.org/) database that adds sup
 
 #### GEOS
 
-An open source geometry library used by CockroachDB, [PostGIS](#postgis), and other projects to provide the calculations underlying various spatial predicate functions and operators. For more information, see <http://trac.osgeo.org/geos/>.
+A geometry library used by CockroachDB, [PostGIS](#postgis), and other projects to provide the calculations underlying various spatial predicate functions and operators. For more information, see <http://trac.osgeo.org/geos/>.
 
 #### GeographicLib
 

src/current/v24.1/changefeed-examples.md

@@ -50,7 +50,7 @@ In this example, you'll set up a changefeed for a single-node cluster that is co
     cockroach start-single-node --insecure --listen-addr=localhost
     ~~~
 
-1. Download and extract the [Confluent Open Source platform](https://www.confluent.io/download/) (which includes Kafka).
+1. Download and extract the [Confluent platform](https://www.confluent.io/download/) (which includes Kafka).
 
 1. In a new terminal window, go to the extracted `confluent-<version>` directory and start Confluent:
 
@@ -191,7 +191,7 @@ In this example, you'll set up a changefeed for a single-node cluster that is co
     cockroach start-single-node --insecure --listen-addr=localhost
     ~~~
 
-1. Download and extract the [Confluent Open Source platform](https://www.confluent.io/download/) (which includes Kafka).
+1. Download and extract the [Confluent platform](https://www.confluent.io/download/) (which includes Kafka).
 
 1. Move into the extracted `confluent-<version>` directory and start Confluent:
 

src/current/v24.1/frequently-asked-questions.md

@@ -141,7 +141,7 @@ See [Install Client Drivers]({% link {{ page.version.version }}/install-client-d
 
 ### Why does CockroachDB use the PostgreSQL wire protocol instead of the MySQL protocol?
 
-CockroachDB uses the PostgreSQL wire protocol because it is better documented than the MySQL protocol, and because PostgreSQL has a liberal Open Source license, similar to BSD or MIT licenses, whereas MySQL has the more restrictive GNU General Public License.
+CockroachDB uses the PostgreSQL wire protocol because it is better documented than the MySQL protocol, and because PostgreSQL has a liberal license, similar to BSD or MIT licenses, whereas MySQL has the more restrictive GNU General Public License.
 
 Note, however, that the protocol used doesn't significantly impact how easy it is to port applications. Swapping out SQL network drivers is rather straightforward in nearly every language. What makes it hard to move from one database to another is the dialect of SQL in use. CockroachDB's dialect is based on PostgreSQL as well.
 

src/current/v24.1/kubernetes-overview.md

@@ -8,7 +8,7 @@ docs_area: deploy
 key: operate-cockroachdb-kubernetes.html
 ---
 
-Kubernetes is a portable, extensible, open source platform for managing containerized workloads and services. For a given workload, you provide Kubernetes with a configuration, and Kubernetes applies that configuration to all Kubernetes nodes that are running the application.
+Kubernetes is a portable, extensible platform for managing containerized workloads and services. For a given workload, you provide Kubernetes with a configuration, and Kubernetes applies that configuration to all Kubernetes nodes that are running the application.
 
 CockroachDB can be deployed and managed on Kubernetes using the following methods:
 

src/current/v24.1/monitor-cockroachdb-kubernetes.md

@@ -28,7 +28,7 @@ If you [deployed CockroachDB on Red Hat OpenShift]({% link {{ page.version.versi
 
 ## Configure Prometheus
 
-Every node of a CockroachDB cluster exports granular timeseries metrics formatted for easy integration with [Prometheus](https://prometheus.io/), an open source tool for storing, aggregating, and querying timeseries data. This section shows you how to orchestrate Prometheus as part of your Kubernetes cluster and pull these metrics into Prometheus for external monitoring.
+Every node of a CockroachDB cluster exports granular timeseries metrics formatted for easy integration with [Prometheus](https://prometheus.io/), a tool for storing, aggregating, and querying timeseries data. This section shows you how to orchestrate Prometheus as part of your Kubernetes cluster and pull these metrics into Prometheus for external monitoring.
 
 This guidance is based on [CoreOS's Prometheus Operator](https://github.com/coreos/prometheus-operator/blob/master/Documentation/user-guides/getting-started.md), which allows a Prometheus instance to be managed using built-in Kubernetes concepts.