DOCS-11134: RFM fixes

Author: ravindk89

source/tutorial/change-oplog-size.txt

@@ -51,10 +51,7 @@ database and run :method:`db.collection.stats()` against the
 ``oplog.rs`` collection. :method:`~db.collection.stats()` displays the 
 oplog size as :data:`~collStats.maxSize`.
 
-The following operation displays the oplog size using the 
-:method:`db.collection.stats()` command and 
-:data:`~collStats.maxSize`:
-
+.. class:: copyable-code
 .. code-block:: javascript
 
    use local