Suggesting couple of changes to the document (#22298)

* Suggesting couple of changes to the document

Line 15 should be modified to use your application instead of an application, same way it is being used in other auth docs.

typo in line 76, can is repeated twice . Correcting that typo

* Update docs/sources/auth/gitlab.md

Co-Authored-By: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

* Update gitlab.md

Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>
Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

docs/sources/auth/gitlab.md

@@ -12,7 +12,7 @@ weight = 5
 
 # GitLab OAuth2 Authentication
 
-To enable the GitLab OAuth2 you must register an application in GitLab. GitLab will generate a client ID and secret key for you to use.
+To enable GitLab OAuth2 you must register the application in GitLab. GitLab will generate a client ID and secret key for you to use.
 
 ## Create GitLab OAuth keys
 
@@ -73,7 +73,7 @@ who can authenticate on GitLab will be able to login on your Grafana instance;
 if you use the public `gitlab.com`, it means anyone in the world would be able
 to login on your Grafana instance.
 
-You can can however limit access to only members of a given group or list of
+You can limit access to only members of a given group or list of
 groups by setting the `allowed_groups` option.
 
 ### allowed_groups
@@ -126,4 +126,3 @@ the correct teams.
 Your GitLab groups can be referenced in the same way as `allowed_groups`, like `example` or `foo/bar`.
 
 [Learn more about Team Sync]({{< relref "team-sync.md" >}})
-