Merge branch 'patch-28' into 'master'

corrects microsoft_teams.md webhook url in docs

See merge request gitlab-org/gitlab-ce!21399

doc/user/project/integrations/microsoft_teams.md

@@ -2,7 +2,7 @@
 ## On Microsoft Teams
-To enable Microsoft Teams integration you must create an incoming webhook integration on Microsoft Teams by following the steps described in this [document](https://docs.microsoft.com/en-us/microsoftteams/platform/concepts/connectors#setting-up-a-custom-incoming-webhook).
+To enable Microsoft Teams integration you must create an incoming webhook integration on Microsoft Teams by following the steps described in this [document](https://docs.microsoft.com/en-us/microsoftteams/platform/concepts/connectors/connectors-using#setting-up-a-custom-incoming-webhook).
 ## On GitLab