DOCS-661 fix missing default domain directive

Author: kay-kim

source/core/data-modeling.txt

@@ -18,7 +18,7 @@ that:
   of data.
 
 Each document only needs to contain relevant fields to the entity or
-object that the document represents. In practice, *most documents in a
+object that the document represents. In practice, *most* documents in a
 collection share a similar structure. Schema flexibility means that
 you can model your documents in MongoDB so that they can closely
 resemble and reflect application-level objects.

source/tutorial/model-embedded-one-to-one-relationships-between-documents.txt

@@ -4,7 +4,7 @@
 Model Embedded One-to-One Relationships Between Documents
 =========================================================
 
-.. default-domain::
+.. default-domain:: mongodb
 
 Overview
 --------