fix gitconfig url insteadOf example

Previous example would result in quote escaping problem

pillar.example

@@ -96,7 +96,7 @@ users:
     gitconfig:
       user.name: B User
       user.email: buser@example.com
-      url."https://".insteadOf: "git://"
+      "url.https://.insteadOf": "git://"
 
     google_2fa: True
     google_auth: