Update bson-types.txt

Author: bagratte

source/reference/bson-types.txt

@@ -112,8 +112,8 @@ value.
 
 If you insert a document containing an empty BSON timestamp in a top-level
 field, the MongoDB server will replace that empty timestamp with the current
-timestamp value. For example, if you create an insert a document with
-a timestamp value, as in the following operation:
+timestamp value. For example, if you insert a document with a timestamp
+value, as in the following operation:
 
 .. code-block:: javascript