minor: fixing broken links

Author: Sam Kleinman

source/release-notes/2.2.txt

@@ -310,7 +310,7 @@ The :program:`mongooplog` tool makes it possible to pull :term:`oplog`
 entries from :program:`mongod` instance and apply them to another
 :program:`mongod` instance. You can use :program:`mongooplog` to
 achieve point-in-time backup of a MongoDB data set. See the
-:issue:`SERVER-3873` case and the :docs:`/reference/mongooplog`
+:issue:`SERVER-3873` case and the :doc:`/reference/mongooplog`
 documentation.
 
 Authentication Support for ``mongotop`` and ``mongostat``