Merge pull request #103284 from that-guy-is-it/patch-2

Update troubleshoot-managed-grafana.md

Author: jborsecnik

articles/managed-grafana/troubleshoot-managed-grafana.md

@@ -47,7 +47,7 @@ If you get an error while filling out the form to create the Managed Grafana ins
 Enter a name that:
 
 - Is unique in the entire Azure region. It can't already be used by another user.
-- Is 30 characters long or smaller
+- Is 23 characters long or smaller
 - Begins with a letter. The rest can only be alphanumeric characters or hyphens, and the name must end with an alphanumeric character.
 
 ### Solution 2: review deployment error