DOCS-14626 restore node (#2382)

* DOCS-14626 restore node

* DOCS-14626 restore node

* Review feedback

Author: Dave Cuthbert

source/tutorial/expand-replica-set.txt

@@ -37,27 +37,39 @@ to manage member processes.
 Existing Members
 ~~~~~~~~~~~~~~~~
 
-You can use these procedures to add new members to an existing
-set. You can also use the same procedure to "re-add" a removed
-member. If the removed member's data is still relatively recent, it
-can recover and catch up easily.
+You can use these procedures to add new members to an existing replica
+set.
 
+Restore Former Members
+~~~~~~~~~~~~~~~~~~~~~~
+
+You can use these procedures to re-add a node that was removed.
+
+If the data on the removed node is relatively recent, the node recovers
+and catches up to the rest of the replica set. 
+
+.. important::
+ 
+   Avoid creating new replicated collections on the removed node while
+   it is in standalone mode. If the standalone node rejoins the replica
+   set, subsequent operations on the new collection produce an error. 
 
 Data Files
 ~~~~~~~~~~
 
 If you have a backup or snapshot of an existing member, you can move
-the data files (e.g.  the :setting:`~storage.dbPath` directory) to a new system
-and use them to quickly initiate a new member. The files must be:
+the data files (for example, the :setting:`~storage.dbPath` directory)
+to a new system and use them to quickly initiate a new member. The files
+must be:
 
 - A valid copy of the data files from a member of the same replica
   set. See :doc:`/tutorial/backup-with-filesystem-snapshots`
   document for more information.
 
   .. important:: Always use filesystem snapshots to create a copy of a
      member of the existing replica set. **Do not** use
-     :binary:`~bin.mongodump` and :binary:`~bin.mongorestore` to seed a new
-     replica set member.
+     :binary:`~bin.mongodump` and :binary:`~bin.mongorestore` to seed a
+     new replica set member.
 
 - More recent than the oldest operation in the :term:`primary's
   <primary>` :term:`oplog`. The new member must be able to become