Local registry is default so let's keep commands shorter

Author: solsson

README.md

@@ -13,7 +13,8 @@ The examples below use the [tm](https://github.com/triggermesh/tm/releases/tag/v
 To combine the runtime with your source, the examples below produce a new Docker image each time.
 While these images can be considered temporary,
 builds must be pushed to a Docker registry in order for Kubernetes to be able to pull.
-In the `tm` commands below we use [Knative Local Registry](https://github.com/triggermesh/knative-local-registry)
+By default `tm` uses [Knative Local Registry](https://github.com/triggermesh/knative-local-registry)
+- equivalent to adding `--registry-host knative.registry.svc.cluster.local` to the commands below -
 so that builds can run without registry authentication.
 To use your own registry, replace `--registry-host` with secrets according to [tm docs](https://github.com/triggermesh/tm#docker-registry).
 
@@ -32,7 +33,6 @@ tm deploy service python-test -f https://github.com/serverless/examples \
                               --build-template knative-python37-runtime \
                               --build-argument DIRECTORY=aws-python-simple-http-endpoint \
                               --build-argument HANDLER=handler.endpoint \
-                              --registry-host knative.registry.svc.cluster.local \
                               --wait
 ```
 
@@ -63,7 +63,6 @@ tm deploy service node4-test -f https://github.com/serverless/examples \
                              --build-template knative-node4-runtime \
                              --build-argument DIRECTORY=aws-node-serve-dynamic-html-via-http-endpoint \
                              --build-argument HANDLER=handler.landingPage \
-                             --registry-host knative.registry.svc.cluster.local \
                              --wait
 ```
 
@@ -107,7 +106,6 @@ tm deploy buildtemplate -f https://raw.githubusercontent.com/triggermesh/knative
 ```
 tm deploy service node-lambda -f . --build-template knative-node10-runtime \
                                    --build-argument HANDLER=handler.sayHelloAsync \
-                                   --registry-host knative.registry.svc.cluster.local \
                                    --wait
 ```