Fix a typo in the Route 53 product name

Author: joshbean

README.md

@@ -48,7 +48,7 @@ The security headers can help mitigate some attacks, as explained in this blog p
 For more information, see [Mozilla’s web security guidelines](https://infosec.mozilla.org/guidelines/web_security).
 
 ## Prerequisites
-You must have a registered domain name, such as example.com, and point it to a Route53 hosted zone in the same AWS account in which you deploy this solution. For more information, see [Configuring Amazon Route 53 as your DNS service](https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/dns-configuring.html).
+You must have a registered domain name, such as example.com, and point it to a Route 53 hosted zone in the same AWS account in which you deploy this solution. For more information, see [Configuring Amazon Route 53 as your DNS service](https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/dns-configuring.html).
 
 > **Note:** This solution can fail if you have an existing ACM certificate for the domain name that you use with this solution. If the existing certificate is not in use, we recommend deleting it before you deploy this solution.
 
@@ -71,7 +71,7 @@ To deploy the solution, you use [AWS CloudFormation](https://aws.amazon.com/clou
    following fields:
 
     - **SubDomain:** The subdomain for your registered domain name. Viewers use the subdomain to access your website, for example: www.example.com. We recommend using the default value of **www** as the subdomain.
-    - **DomainName:** Your registered domain name, such as example.com. This domain must be pointed to a Route53 hosted zone.
+    - **DomainName:** Your registered domain name, such as example.com. This domain must be pointed to a Route 53 hosted zone.
 
    After entering values, choose the **Next** button.
 5. On the **Configure stack options** page, you can optionally [add tags and other stack options](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/cfn-console-add-tags.html). When finished, choose the **Next** button.