minor: correcting lock table syntax

Author: Sam Kleinman

draft/commands-locks.txt

@@ -7,7 +7,6 @@ Locks Used By Database Commands
 This table reflects the locks used by the :term:`database commands <database
 command>` in MongoDB. 
 
-
 .. To recollect this data look for the following formulations in the
    MongoDB source code. 
 
@@ -24,7 +23,7 @@ command>` in MongoDB.
 
 .. list-table::
    :header-rows: 1
-   :width: 70, 10, 10, 10
+   :widths: 70, 10, 10, 10
 
    * - **Command**
      - **Lock Type**