(DOCS-7159): Add tcmalloc verbosity section to serverStatus() (#2167) (#2183)

* Add tcmalloc section to serverStatus()

* copy review feedback

* Update source/reference/command/serverStatus.txt

Co-authored-by: Kyle Suarez <[email protected]>

Co-authored-by: Kyle Suarez <[email protected]>

Co-authored-by: Kyle Suarez <[email protected]>

Author: davidhou17

source/reference/command/serverStatus.txt

@@ -99,6 +99,30 @@ After you run an update query, ``db.serverStatus()`` and
       "total" : NumberLong(1)
    }
 
+Change ``tcmalloc`` Verbosity
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+By default, ``tcmalloc`` information is included in the output. This
+section provides memory allocation statistics for your database. To
+change the verbosity of the ``tcmalloc`` section, specify an integer 
+between ``0`` and ``2`` (inclusive):
+
+.. code-block:: javascript
+
+   db.runCommand( { serverStatus: 1, tcmalloc: <int> } )
+
+The command has the following behavior:
+
+- By default, ``tcmalloc`` is set to ``1``.
+- Passing a larger integer value increases the verbosity.
+- Passing ``0`` or ``false`` omits the ``tcmalloc`` section from the
+  output. 
+- Passing any other input results in the default setting.
+
+For more information about how MongoDB allocates memory, see `TCMalloc`_.
+
+.. _`TCMalloc`: http://goog-perftools.sourceforge.net/doc/tcmalloc.html
+
 .. _server-status-output:
 
 Output