minor copy edits to the v8 javascript lock statements

source/applications/map-reduce.txt

@@ -238,7 +238,7 @@ These various tasks take the following locks:
   ``merge``, ``replace``, ``reduce``) take a write lock.
 
 .. versionchanged:: 2.4
-   The V8 JavaScript engine, which became the default in 2.4 allows
+   The V8 JavaScript engine, which became the default in 2.4, allows
    multiple JavaScript operations to execute at the same time. Prior to
    2.4, JavaScript code (i.e. ``map``, ``reduce``, ``finalize``
    functions) executed in a single thread.

source/reference/command/eval.txt

@@ -155,7 +155,7 @@ eval
       - .. include:: /includes/fact-eval-authentication.rst
 
    .. versionchanged:: 2.4
-      The V8 JavaScript engine, which became the default in 2.4 allows
+      The V8 JavaScript engine, which became the default in 2.4, allows
       multiple JavaScript operations to execute at the same
       time. Prior to 2.4, :dbcommand:`eval` executed in a single
       thread.

source/reference/command/group.txt

@@ -84,13 +84,16 @@ group
         groupings, use :dbcommand:`mapReduce`. Previous versions had a
         limit of 10,000 elements.
 
+      .. putting the blank line between the version changed directive
+         since the directive cannot seem to handle the include or the
+         list at all
       .. versionchanged:: 2.4
 
-         - .. include:: /includes/fact-group-map-reduce-where-limitations-in-24.rst
+      - .. include:: /includes/fact-group-map-reduce-where-limitations-in-24.rst
 
-         - Prior to 2.4, the :dbcommand:`group` command took the
-           :program:`mongod` instance's JavaScript
-           lock, which blocked all other JavaScript execution.
+      - Prior to 2.4, the :dbcommand:`group` command took the
+        :program:`mongod` instance's JavaScript lock, which blocked
+        all other JavaScript execution.
 
    For the shell, MongoDB provides a wrapper method
    :method:`db.collection.group()`; however, the

source/reference/method/db.collection.group.txt

@@ -72,8 +72,9 @@ db.collection.group()
 
       - .. include:: /includes/fact-group-map-reduce-where-limitations-in-24.rst
 
-      - Prior to 2.4, the :method:`db.collection.group()` method took a
-        JavaScript lock.
+      - Prior to 2.4, the :method:`db.collection.group()` method took
+        the :program:`mongod` instance's JavaScript lock, which blocked
+        all other JavaScript execution.
 
 Consider the following examples of the :method:`db.collection.group()` method:
 

source/reference/method/db.eval.txt

@@ -113,9 +113,10 @@ db.eval()
       - .. include:: /includes/fact-eval-authentication.rst
 
    .. versionchanged:: 2.4
-      The V8 JavaScript engine added in 2.4 allows multiple JavaScript
-      operations to run at the same time. Prior to 2.4,
-      :method:`db.eval()` would take a JavaScript lock.
+      The V8 JavaScript engine, which became the default in 2.4, allows
+      multiple JavaScript operations to execute at the same
+      time. Prior to 2.4, :method:`db.eval()` executed in a single
+      thread.
 
    .. seealso::