Update and fix numerous issues with exit codes.

Signed-off-by: kay <[email protected]>

Author: milkie

source/reference/exit-codes.txt

@@ -31,26 +31,21 @@ issues with :program:`mongod` and :program:`mongos` instances.
 
    Returned by :program:`mongod` if there is a mismatch between hostnames
    specified on the command line and in the :data:`local.sources`
-   collection. :program:`mongod` may also return this status if
-   :term:`oplog` collection in the ``local`` database is not readable.
+   collection, in master/slave mode.
 
    .. symbol: EXIT_REPLICATION_ERROR = 3
 
 .. error:: 4
 
    The version of the database is different from the version supported
    by the :program:`mongod` (or :program:`mongod.exe`) instance.  The
-   instance exits cleanly.  Restart :program:`mongod` with the
-   :option:`--upgrade <mongod --upgrade>` option to upgrade the
-   database to the version supported by this :program:`mongod`
-   instance.
-
+   instance exits cleanly.  
+   
    .. symbol: EXIT_NEED_UPGRADE = 4
 
 .. error:: 5
 
-   Returned by :program:`mongod` if a :dbcommand:`moveChunk` operation
-   fails to confirm a commit.
+   Returned by :program:`mongos` if a problem is encountered during initialization.
 
    .. symbol: EXIT_SHARDING_ERROR = 5
 
@@ -65,7 +60,7 @@ issues with :program:`mongod` and :program:`mongos` instances.
 
    Returned by MongoDB applications which encounter an unrecoverable
    error, an uncaught exception or uncaught signal.  The system exits
-   without performing a clean shut down.
+   without performing a clean shutdown.
 
    .. symbol: EXIT_ABRUPT = 14
 
@@ -74,7 +69,7 @@ issues with :program:`mongod` and :program:`mongos` instances.
    *Message:* ``ERROR: wsastartup failed <reason>``
 
    Returned by MongoDB applications on Windows following an error in the
-   WSAStartup function.
+   WSAStartup function, used to initialize the networking subsystem.
 
    *Message:* ``NT Service Error``
 
@@ -83,36 +78,13 @@ issues with :program:`mongod` and :program:`mongos` instances.
 
    .. symbol: EXIT_NTSERVICE_ERROR = 20
 
-.. error:: 45
-
-   Returned when a MongoDB application cannot open a file or cannot
-   obtain a lock on a file.
-
-   .. Symbol: EXIT_FS
-
-.. error:: 47
-
-   MongoDB applications exit cleanly following a large clock skew (32768
-   milliseconds) event.
-
-   .. symbol: EXIT_CLOCK_SKEW
-
 .. error:: 48
 
-   :program:`mongod` exits cleanly if the server socket closes. The
-   server socket is on port ``27017`` by default, or as specified to
-   the :option:`--port <mongod --port>` run-time option.
-
+   A newly started :program:`mongod` or :program:`mongos` could not start listening for incoming connections,
+   due to an error.
+   
    .. symbol: EXIT_NET_ERROR = 48
 
-.. error:: 49
-
-   Returned by :program:`mongod.exe` or :program:`mongos.exe` on Windows
-   when either receives a shutdown message from the
-   :guilabel:`Windows Service Control Manager`.
-
-   .. symbol: EXIT_WINDOWS_SERVICE_STOP 49
-
 .. error:: 100
 
    Returned by :program:`mongod` when the process throws an uncaught exception.