Remove Google sign-in requirement

doc/user/project/clusters/index.md

@@ -23,8 +23,6 @@ prerequisites must be met:
 - The [Google authentication integration](../../../integration/google.md) must
   be enabled in GitLab at the instance level. If that's not the case, ask your
   administrator to enable it.
-- Your Google account must be associated with your GitLab one. If you haven't
-  done this already, you will be asked in the **Cluster** page.
 - Your associated Google account must have the right privileges to manage
   clusters on GKE.
 - You must have Master [permissions] in order to be able to access the **Cluster**
@@ -32,10 +30,6 @@ prerequisites must be met:
 
 If all of the above requirements are met, you can proceed to add a new cluster.
 
-TIP: **Tip:**
-Check your existing connected accounts by navigating to your account's settings
-under the **Account > Social sign-in** section.
-
 ## Adding a cluster
 
 NOTE: **Note:**