made opening sentence uniform (#37)

Author: kyuan-mongodb

source/usage-examples/bulkWrite.txt

@@ -4,7 +4,7 @@ Perform Bulk Operations
 
 .. default-domain:: mongodb
 
-You can perform bulk write operations on a collection using the
+You can perform bulk write operations on a collection by using the
 ``BulkWrite()`` method.
 
 The following example specifies a slice of ``WriteModels`` and an option

source/usage-examples/command.txt

@@ -4,7 +4,7 @@ Run a Command
 
 .. default-domain:: mongodb
 
-You can run commands directly on your MongoDB server using the
+You can run commands directly on your MongoDB server by using the
 ``RunCommand()`` method.
 
 The following example passes a document containing the ``"dbStats"``

source/usage-examples/count.txt

@@ -5,8 +5,8 @@ Count Documents
 .. default-domain:: mongodb
 
 You can get an approximation on the number of documents in a
-collection using the ``EstimatedDocumentCount()`` method and an exact
-number of documents in a collection using the ``CountDocuments()``
+collection by using the ``EstimatedDocumentCount()`` method and an exact
+number of documents in a collection by using the ``CountDocuments()``
 method.
 
 The following example uses the ``EstimatedDocumentCount()`` method to

source/usage-examples/deleteOne.txt

@@ -4,7 +4,7 @@ Delete a Document
 
 .. default-domain:: mongodb
 
-You can delete a document in a collection using the ``DeleteOne()``
+You can delete a document in a collection by using the ``DeleteOne()``
 method. 
 
 The following example specifies a query filter to the ``DeleteOne()``

source/usage-examples/struct-tagging.txt

@@ -5,7 +5,7 @@ Use Struct Tags
 .. default-domain:: mongodb
 
 You can specify the way that the Go Driver converts Go
-structs to :manual:`BSON </reference/bson-types/>` using struct tags.
+structs to :manual:`BSON </reference/bson-types/>` by using struct tags.
 
 The following code declares a ``BlogPost`` struct, where the ``WordCount`` field
 has a struct tag that sets a custom BSON field name of ``word_count``.