DOCSP-17317 Include count in collstats command (#173)

* DOCSP-17317 Include count in collstats command

* DOCSP-17317 updates for review feedback

Author: kanchana-mongodb

source/supported-unsupported/mql-support.txt

@@ -132,7 +132,6 @@ Diagnostic Commands
 
      - The following fields are omitted from the response:
 
-       * ``count``
        * ``avgObjSize``
        * ``capped``
        * ``max``
@@ -152,8 +151,12 @@ Diagnostic Commands
        **partitions.attributes**
          The filtering attributes of the partition.
 
+       **partitions.count**
+         The number of documents in the partition.
+
        **partitions.source**
-         The |s3| URL or |service| cluster name, which is the backing data of the partition.
+         The |s3| URL or |service| cluster name, which is the backing 
+         data of the partition.
 
        **partitions.size**
          The size, in bytes, of the partition.
@@ -162,7 +165,7 @@ Diagnostic Commands
          The number of partitions.
 
        **avgPartitionSize**
-         The average size of all paritions.
+         The average size of all partitions.
 
        .. example::
 
@@ -171,8 +174,9 @@ Diagnostic Commands
              {
                ...
                 "partitions": [{
-    	           "format": <file format>,
+    	            "format": <file format>,
     	            "attributes": <filtering attributes>,
+    	            "count": <number of documents in partition>,
     	            "source": <S3 url or Atlas cluster name>,
     	            "size": <size, in bytes, of the partition>
     	           }, ...],