RM PR fixes 2

Author: rustagir

source/whats-new.txt

@@ -128,7 +128,7 @@ improvements, and fixes:
 
   - :phpmethod:`MongoDB\Client::getDatabase()`: alias for :phpmethod:`MongoDB\Client::selectDatabase()`
   - :phpmethod:`MongoDB\Database::getCollection()`: alias for :phpmethod:`MongoDB\Database::selectCollection()`
-  - :phpmethod:`MongoDB\Client::getCollection()`
+  - :phpmethod:`MongoDB\Database::getCollection()`: alias for :phpmethod:`MongoDB\Database::selectCollection()`
 
   The ``Client::selectCollection()``, ``Client::selectDatabase()``, and
   ``Database::selectCollection()`` methods will be deprecated and