DOCSP-40217 -- Remove reference to shared tier clusters in indexes limitations (#643)

* DOCSP-40217 -- remove reference to shared tier clusters in indexes limitations

* DOCSP-40217 -- repush for Snooty build

Author: jvincent-mongodb

source/indexes.txt

@@ -158,6 +158,7 @@ index.
       |compass-short| removes the :guilabel:`Hidden` badge from the 
       :guilabel:`Properties` column.
 
+
 .. _drop-index:
 
 Drop an Index
@@ -179,8 +180,7 @@ Limitations
 
   .. tip::
 
-     For clusters running an earlier version of MongoDB or 
-     :ref:`shared tier clusters <shared-tier-cluster>`, 
+     For clusters running an earlier version of MongoDB, 
      you can manage your Atlas Search indexes using the Atlas UI, the 
      :ref:`Atlas CLI <atlas-cli>`, or the 
      :ref:`Atlas Administration API <atlas-admin-api>`.