Revert "DOCSP-38784: Sharded cluster retries (#539)" (#541)

This reverts commit 43ab2e3.

Author: norareidy

source/whats-new.txt

@@ -56,15 +56,6 @@ Deprecations in 5.1
   deployment, see :manual:`Release Notes </release-notes>` in the {+mdb-server+}
   manual.
 
-.. _java-behavioral-changes-5.1:
-
-Behavioral Changes in 5.1
-~~~~~~~~~~~~~~~~~~~~~~~~~
-
-- When a sharded cluster operation is unsuccessful, the {+driver-short+} avoids selecting
-  the same ``mongos`` server for operation retry attempts if other ``mongos`` servers are
-  available.  
-
 .. _java-new-features-5.1:
 
 New Features in 5.1