docs/aws: Fix highlighting of ECR in sidebar

Author: radeksimko

website/source/layouts/aws.erb

@@ -177,7 +177,7 @@
                 </li>
 
 
-                <li<%= sidebar_current(/^docs-aws-resource-ecs/) %>>
+                <li<%= sidebar_current(/^docs-aws-resource-(ecs|ecr)/) %>>
                     <a href="#">ECS Resources</a>
                     <ul class="nav nav-visible">