update mongoc_write_concern_t doc

Author: ajdavis

doc/mongoc_write_concern_t.rst

@@ -28,22 +28,22 @@ See `Write Concern <http://docs.mongodb.org/manual/core/write-concern/>`_ on the
 Write Concern Levels
 --------------------
 
+Set the write concern level with :symbol:`mongoc_write_concern_set_w`.
+
 ==========================================  ===============================================================================================================================================================================================================
 MONGOC_WRITE_CONCERN_W_DEFAULT (1)          By default, writes block awaiting acknowledgment from MongoDB. Acknowledged write concern allows clients to catch network, duplicate key, and other errors.                                                    
 MONGOC_WRITE_CONCERN_W_UNACKNOWLEDGED (0)   With this write concern, MongoDB does not acknowledge the receipt of write operation. Unacknowledged is similar to errors ignored; however, mongoc attempts to receive and handle network errors when possible.
 MONGOC_WRITE_CONCERN_W_MAJORITY (majority)  Block until a write has been propagated to a majority of the nodes in the replica set.                                                                                                                         
 n                                           Block until a write has been propagated to at least ``n`` nodes in the replica set.                                                                                                                            
 ==========================================  ===============================================================================================================================================================================================================
 
-=======  ===================================================================
-journal  Block until the node receiving the write has committed the journal.
-=======  ===================================================================
-
-Deprecation
------------
+Deprecations
+------------
 
 The write concern ``MONGOC_WRITE_CONCERN_W_ERRORS_IGNORED`` (value -1) is a deprecated synonym for ``MONGOC_WRITE_CONCERN_W_UNACKNOWLEDGED`` (value 0), and will be removed in the next major release.
 
+:symbol:`mongoc_write_concern_set_fsync` is deprecated.
+
 .. only:: html
 
   Functions