Revert "(DOCS-16452) routingTableCacheChunkBucketSize must be greater than 0 (#5198)" (#5223)

This reverts commit a55f624.

Author: sarahsimpers

source/reference/parameters.txt

@@ -4027,16 +4027,15 @@ Sharding Parameters
 
    .. versionadded:: 7.0.1
 
-   .. versionchanged:: 7.2
-
    |both|
 
    *Type*: integer
 
    *Default*: 500
 
    Specifies the size of the routing table cache buckets used to 
-   implement chunk grouping optimization. Must be greater than ``0``.
+   implement chunk grouping optimization. Must be greater than or equal 
+   to ``0``.
 
    For example, to set the cache chunk bucket size to ``250`` on a 
    ``mongod``, issue the following command at startup: