DOCSP-13748 clarify numInitialChunk meaning

Author: npentrel

source/reference/command/shardCollection.txt

@@ -98,12 +98,11 @@ Definition
       * - ``numInitialChunks``
 
         - integer
-   
-        - Specifies the number of chunks to create
-          initially when sharding an *empty* collection with a :ref:`hashed
-          shard key <sharding-hashed-sharding>`. MongoDB will then create and
-          balance chunks across the cluster. The ``numInitialChunks`` must be
-          less than ``8192`` per shard.
+        - Specifies the initial number of chunks to create across all shards in
+          the cluster when sharding an *empty* collection with a
+          :ref:`hashed shard key <sharding-hashed-sharding>`. MongoDB
+          will then create and balance chunks across the cluster. The
+          ``numInitialChunks`` must result in less than ``8192`` per shard.
 
           .. versionchanged:: 4.0.3