DOCS-466 minor tweaks

Author: Sam Kleinman

source/reference/replica-commands.txt

@@ -4,10 +4,15 @@ Replica Set Commands
 
 .. default-domain:: mongodb
 
-This reference describes the JavaScript methods and the database commands that
-can be used on replica sets.
+This reference collects documentation for all :ref:`JavaScript methods
+<replica-set-javascript-methods>` for the :program:`mongo` shell that
+support :term:`replica set` functionality, as well as all
+:ref:`database commands <replica-set-database-commands>` related to
+replication function.
 
-For a list of all replica set documentation, see :doc:`/replication`.
+See :doc:`/replication`, for a list of all replica set documentation.
+
+.. _replica-set-javascript-methods:
 
 JavaScript Methods
 ------------------
@@ -22,6 +27,9 @@ methods, see :doc:`/reference/method`.
 .. include:: method/rs.status.txt
    :start-after: mongodb
 
+.. include:: method/db.isMaster.txt
+   :start-after: mongodb
+
 .. include:: method/rs.initiate.txt
    :start-after: mongodb
 
@@ -58,6 +66,8 @@ methods, see :doc:`/reference/method`.
 .. include:: method/rs.syncFrom.txt
    :start-after: mongodb
 
+.. _replica-set-database-commands:
+
 Database Commands
 -----------------
 
@@ -67,6 +77,9 @@ Database Commands
 The following commands apply to replica sets. For a complete list of all
 commands, see :doc:`/reference/commands`.
 
+.. include:: command/isMaster.txt
+   :start-after: mongodb
+
 .. include:: command/resync.txt
    :start-after: mongodb
 
@@ -87,5 +100,3 @@ commands, see :doc:`/reference/commands`.
 
 .. include:: command/replSetSyncFrom.txt
    :start-after: mongodb
-
-