DOCS-249 minor edits

Author: Bob Grabar

draft/core/write-operations.txt

@@ -25,7 +25,7 @@ database, see the following:
 - :doc:`/applications/update`
 - :doc:`/applications/delete`
 
-For information specific :program:`mongo` shell methods used in write
+For information on specific :program:`mongo` shell methods used in write
 operations, see the following:
 
 - :method:`db.collection.insert()`
@@ -50,7 +50,7 @@ Write Concern
 
 :term:`Write concern <write concern>` confirms the success of write
 operations to MongoDB databases by returning an object indicating
-operational success. Beginning with version 2.4, the :program:`mongo`
+operational success. Beginning with version 2.2.x, the :program:`mongo`
 shell enables write concern by default. In previous versions the shell
 disabled write concern by default.
 
@@ -71,7 +71,7 @@ received the write operation and has committed the operation to the
 in-memory representation of the database. This provides a simple and
 low-latency level of write concern and will allow your application to
 detect situations where the :program:`mongod` instance becomes
-inaccessible or insertion errors caused by :ref:`duplicate key errors
+inaccessible or detect insertion errors caused by :ref:`duplicate key errors
 <index-type-unique>`.
 
 You can modify the level of write concern returned by issuing the