update ref

Author: stephmarie17

source/crud/update/replace.txt

@@ -115,7 +115,7 @@ and the immutable ``_id`` field as follows:
 
 If a replace operation fails to match any documents in a collection, it
 does not make any changes. Replace operations can be configured to perform
-an :doc:`upsert </crud/update>` which
+an :ref:`upsert </crud/update>` which
 attempts to perform the replacement, but if no documents are matched, it
 inserts a new document with the specified fields and values.