[v11.3.x] removing outdated versioning info from GCM data source docs (#97444)

removing outdated versioning info from GCM data source docs (#96854)

* removing outdated versioning info from GCM data source docs

* deleting missed admonition closure

(cherry picked from commit 3724ffd858)

Co-authored-by: Jacob Valdez <jacob.valdez@grafana.com>

docs/sources/datasources/google-cloud-monitoring/_index.md

@@ -50,10 +50,6 @@ refs:
 Grafana ships with built-in support for Google Cloud Monitoring.
 This topic describes queries, templates, variables, and other configuration specific to the Google Cloud Monitoring data source.
 
-{{% admonition type="note" %}}
-Before Grafana v7.1, Google Cloud Monitoring was referred to as Google Stackdriver.
-{{% /admonition %}}
-
 For instructions on how to add a data source to Grafana, refer to the [administration documentation](ref:data-source-management).
 Only users with the organization administrator role can add data sources.