fix: update link example in PR template (aws-amplify#6730)

Author: hbuchel

.github/PULL_REQUEST_TEMPLATE.md

@@ -31,8 +31,8 @@ Which platform(s) are affected by this PR (if applicable)?
 - [ ] Are any files being deleted with this PR? If so, have the needed redirects been created?
 
 - [ ] Are all links in MDX files using the MDX link syntax rather than HTML link syntax? <br /> 
-      _ref: MDX: `[link](https://link.com)` 
-            HTML: `<a href="https://link.com">link</a>`_
+      _ref: MDX: `[link](https://docs.amplify.aws/)` 
+            HTML: `<a href="https://docs.amplify.aws/">link</a>`_
 
 ### When this PR is ready to merge, please check the box below
 - [ ] Ready to merge