wraps server in quotes (#1421)

Author: jmd-mongo

source/includes/steps-log-rotate-rename.yaml

@@ -30,7 +30,7 @@ pre: |
 action:
   language: sh
   code: |
-    db.adminCommand( { logRotate : server } )
+    db.adminCommand( { logRotate : "server" } )
 post: |
   If :doc:`auditing </core/auditing>` is enabled, you can specify ``1``
   to ``logRotate`` (instead of  ``server``) to rotate both the server