DOCSP-24245 link to perCollection chunk (#2013)

* DOCSP-24245 link to perCollection chunk

* Review feedback

Author: Dave Cuthbert

source/tutorial/modify-chunk-size-in-sharded-cluster.txt

@@ -20,7 +20,10 @@ migrations, a small chunk size leads to more rapid and frequent
 migrations. The allowed range of the chunk size is between 1 and 1024
 megabytes, inclusive.
 
-To modify the chunk size, use the following procedure:
+To modify the chunk size for a collection, see
+:dbcommand:`configureCollectionBalancing`.
+
+To modify the chunk size for the entire cluster, use this procedure:
 
 #. Connect to any :binary:`~bin.mongos` in the cluster using
    :binary:`~bin.mongosh`.