minor: edits to dbref page.

Author: Sam Kleinman

source/applications/database-references.txt

@@ -24,27 +24,27 @@ MongoDB applications use one of two methods for relating documents:
    cases.
 
 #. :ref:`DBRefs <dbref>` are references from one document to another
-   using the value of the first documents ``_id`` field collection,
-   and optionally database name. To resolve DBRefs, your application
+   using the value of the first document's ``_id`` field collection,
+   and optional database name. To resolve DBRefs, your application
    must perform additional queries to return the referenced
    documents. Many :doc:`drivers </applications/drivers>` have helper
    methods that form the query for the DBRef automatically. The
    drivers [#offical-driver]_ do not *automatically* resolve DBRefs
    into documents.
 
-   Use DBRefs when you need to embed documents from multiple
+   Use a DBRef when you need to embed documents from multiple
    collections in documents from one collection. DBRefs also provide a
-   common format and type to represent these relationships between
-   documents. DBRefs provide common semantics for representing these
+   common format and type to represent these relationships among
+   documents. The DBRef format provides common semantics for representing
    links between documents if your database must interact with
    multiple frameworks and tools.
 
-Unless you have a compelling reason for using DBrefs, use manual
+Unless you have a compelling reason for using a DBref use manual
 references.
 
 .. [#offical-driver] Some community supported drivers may have
-   alternate behavior and may resolve DBRefs into documents
-   already.
+   alternate behavior and may resolve a DBRef into a document
+   automatically.
 
 .. _document-references: