Fix a backtick typo; increase shell syntax usage

Author: kurtmckee

README.md

@@ -21,7 +21,7 @@ Install [pre-commit](https://pre-commit.com/#install).
 Prior to commit, run:
 
 ```shell
-pre-commit run --all-files`
+pre-commit run --all-files
 ```
 
 
@@ -81,7 +81,7 @@ Create a snapshot repository. This puts the files in the `elasticsearch/snapshot
 the elasticsearch.yml and docker-compose files create a mapping from that directory to 
 `/usr/share/elasticsearch/snapshots` within the Elasticsearch container and grant permissions on using it.
 
-```
+```shell
 curl -X "PUT" "http://localhost:9200/_snapshot/my_fs_backup" \
      -H 'Content-Type: application/json; charset=utf-8' \
      -d $'{
@@ -97,7 +97,7 @@ a snapshot named `my_snapshot_2` and waits for the action to be completed before
 asynchronously, and queried for status. The `indices` parameter determines which indices are snapshotted, and
 can include wildcards.
 
-```
+```shell
 curl -X "PUT" "http://localhost:9200/_snapshot/my_fs_backup/my_snapshot_2?wait_for_completion=true" \
      -H 'Content-Type: application/json; charset=utf-8' \
      -d $'{
@@ -113,20 +113,20 @@ curl -X "PUT" "http://localhost:9200/_snapshot/my_fs_backup/my_snapshot_2?wait_f
 
 To see the status of this snapshot:
 
-```
+```shell
 curl http://localhost:9200/_snapshot/my_fs_backup/my_snapshot_2
 ```
 
 To see all the snapshots:
 
-```
+```shell
 curl http://localhost:9200/_snapshot/my_fs_backup/_all
 ```
 
 To restore a snapshot, run something similar to the following. This specific command will restore any indices that
 match `items_*` and rename them so that the new index name will be suffixed with `-copy`.
 
-```
+```shell
 curl -X "POST" "http://localhost:9200/_snapshot/my_fs_backup/my_snapshot_2/_restore?wait_for_completion=true" \
      -H 'Content-Type: application/json; charset=utf-8' \
      -d $'{
@@ -137,15 +137,14 @@ curl -X "POST" "http://localhost:9200/_snapshot/my_fs_backup/my_snapshot_2/_rest
   "indices": "items_*",
   "rename_pattern": "items_(.+)"
 }'
-
 ```
 
 Now the item documents have been restored in to the new index (e.g., `my-collection-copy`), but the value of the
 `collection` field in those documents is still the original value of `my-collection`. To update these to match the
 new collection name, run the following Elasticsearch Update By Query command, substituting the old collection name
 into the term filter and the new collection name into the script parameter:
 
-```
+```shell
 curl -X "POST" "http://localhost:9200/items_my-collection-copy/_update_by_query" \
      -H 'Content-Type: application/json; charset=utf-8' \
      -d $'{
@@ -164,7 +163,7 @@ curl -X "POST" "http://localhost:9200/items_my-collection-copy/_update_by_query"
 
 Then, create a new collection through the api with the new name for each of the restored indices:
 
-```
+```shell
 curl -X "POST" "http://localhost:8080/collections" \
      -H 'Content-Type: application/json' \
      -d $'{