DOCS-853 shorten sentences and change variable name

Author: kay-kim

source/reference/method/cursor.toArray.txt

@@ -7,9 +7,9 @@ cursor.toArray()
 .. method:: cursor.toArray()
 
    The :method:`toArray() <cursor.toArray()>` method returns an array
-   that contains all the documents from a cursor. The method loads all
-   the documents returned by the cursor into RAM and exhausts the
-   cursor.
+   that contains all the documents from a cursor. The method iterates
+   completely the cursor, loading all the documents into RAM and
+   exhausting the cursor.
 
    :returns: An array of documents.