DOCSP-28986 correct config.set example (#255)

Author: jmd-mongo

source/reference/configure-shell-settings-api.txt

@@ -110,7 +110,7 @@ Settings specified with the ``config`` API:
 
    .. code-block:: javascript
 
-      config.set( "inspectDepth": 10 )
+      config.set( "inspectDepth", 10 )
 
    The value of ``inspectDepth`` becomes ``10``, and will remain ``10``
    even when ``mongosh`` is restarted.