Add Option for 'set' command for Environment Variables along with Export (#176)

* correct uri variable setting eg

* double quotations

* tags

Author: rachel-mack

source/quick-start.txt

@@ -4,7 +4,12 @@
 Quick Start
 ===========
 
-.. default-domain:: mongodb
+.. facet::
+   :name: genre
+   :values: tutorial
+
+.. meta::
+   :keywords: set up, runnable app, initialize, connect
 
 .. contents:: On this page
    :local:
@@ -35,19 +40,22 @@ a connection string similar to the following in your copy buffer:
 Set Your Connection String
 ~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-Run the following code at the command prompt to save your MongoDB connection string to an 
+Run the following code at the command prompt to save your MongoDB
+:ref:`connection string <csharp-connect-to-mongodb>` to an 
 environment variable. This method is safer than including your credentials in your source 
 code. 
 
 .. code-block:: bash
 
-   export MONGODB_URI='<your MongoDB URI>'
+   export MONGODB_URI="<your MongoDB URI>"
 
 .. important::
 
    Make sure to replace the ``<username>`` and ``<password>`` sections of the connection 
    string with the username and password of your Atlas user.
 
+For more information about connection strings, see :manual:`Connection Strings </reference/connection-string/#connection-strings>`.
+
 Set Up Your Project
 -------------------