fix: retryable writes prose test typo (#1490)

Author: durran

source/retryable-writes/tests/README.rst

@@ -493,7 +493,8 @@ and sharded clusters.
 
    6. Disable the fail points.
 
-#. Test that in a sharded cluster on the same mongos if no other is available
+#. Test that in a sharded cluster writes are retried on the same mongos if no
+   other is available
 
    This test MUST be executed against a sharded cluster and requires MongoDB
    4.3.1+ for the ``errorLabels`` fail point option.
@@ -528,6 +529,8 @@ and sharded clusters.
 Changelog
 =========
 
+:2024-01-05: Fix typo in prose test title.
+
 :2024-01-03: Note server version requirements for fail point options and revise
              tests to specify the ``errorLabels`` option at the top-level
              instead of within ``writeConcernError``.