DOCS-356 minor corrections in response to feedback

Author: Sam Kleinman

source/reference/commands.txt

@@ -1469,8 +1469,9 @@ Administration
    there are no errors in the data storage.
 
    As a side effect, the :dbcommand:`repairDatabase` command will
-   compact the database, as the :dbcommand:`compact` command. Use the
-   following syntax.
+   compact the database, as the :dbcommand:`compact` command and
+   reduce the total size of the data files on disk. Use the following
+   syntax:
 
    .. code-block:: javascript
 
@@ -1507,12 +1508,11 @@ Administration
      .. note::
 
         This command will fail if your database is not a master or
-        primary. In most cases, you should recover a currupt secondary
-        using the data from an existing intact node. If you need to
+        primary. In most cases, you should recover a corrupt secondary
+        using the data from an existing intact node. If you must
         repair a secondary or slave node, first restart the node as a
-        standalone mongod by omitting the :option:`--replSet <mongod
-        --replSet>` or :option:`--slave <mongod --slave>` options, as
-        necessary.
+        standalone mongod by omitting the :option:`--replSet <mongod --replSet>`
+        or :option:`--slave <mongod --slave>` options, as necessary.
 
 .. dbcommand:: shutdown
 

source/reference/mongod.txt

@@ -334,8 +334,9 @@ Options
 
 .. option:: --repair
 
-   Runs a repair routine on all databases. This is a similar operation
-   to the :dbcommand:`repairDatabase` database command.
+   Runs a repair routine on all databases. This is equivalent
+   to shutting down and running :dbcommand:`repairDatabase` database
+   command on all databases.
 
    .. include:: /includes/warning-repair.rst