Update GettingStarted.Walkthrough.md

Improve the section on providing parameter values, noting that there are several values that must be provided.

Author: leotohill

doc_source/GettingStarted.Walkthrough.md

@@ -296,9 +296,7 @@ AWS CloudFormation templates that are stored in an S3 bucket must be accessible
 
 1. In the **Specify Details** section, enter a stack name in the **Name** field\. For this example, use **MyWPTestStack**\. The stack name cannot contain spaces\.
 
-1. In the **KeyName** field, enter the name of a valid Amazon EC2 key pair in the same region you are creating the stack\.
-**Note**  
-On the **Specify Parameters** page, you'll recognize the parameters from the Parameters section of the template\.
+1. On the **Specify Parameters** page, you'll recognize the parameters from the Parameters section of the template\. You must provide values for all parameters that do not have default values, including DBUser, DBPassword, DBRootPassword, and KeyName\.  In the **KeyName** field, enter the name of a valid Amazon EC2 key pair in the same region you are creating the stack\.
 
 1. Click **Next**\.
 
@@ -372,4 +370,4 @@ The status for `MyWPTestStack` changes to `DELETE_IN_PROGRESS`\. In the same way
 
 Congratulations\! You successfully picked a template, created a stack, viewed and used its resources, and deleted the stack and its resources\. Not only that, you were able to set up a WordPress blog using a AWS CloudFormation template\. You can find other templates in the [AWS CloudFormation sample template library](http://aws.amazon.com/cloudformation/aws-cloudformation-templates/)\.
 
-Now it's time to learn more about templates so that you can easily modify existing templates or create your own: [Learn template basics](gettingstarted.templatebasics.md)\.
+Now it's time to learn more about templates so that you can easily modify existing templates or create your own: [Learn template basics](gettingstarted.templatebasics.md)\.