DOC-3251_v7: Update v7 docs demos to use new user directory endpoint. (#3822)

* DOC-3251_v7: Update v7 docs demos to use new user directory endpoint.

* Update modules/ROOT/examples/live-demos/full-featured/index.js

Co-authored-by: tiny-ben-tran <ben.tran@tiny.cloud>

* Update modules/ROOT/examples/live-demos/full-featured/index.js

Co-authored-by: tiny-ben-tran <ben.tran@tiny.cloud>

* Update modules/ROOT/examples/live-demos/comments-callback-with-mentions/index.js

Co-authored-by: Mitchell Crompton <mitchell.crompton@tiny.cloud>

* DOC-3251: Include tinycomments_fetch_author_info back to full feature demo.

* DOC-3251: Refactor tinycomments author information handling to use static values.

* DOC-3251: Remove duplicated properties from demo.

---------

Co-authored-by: tiny-ben-tran <ben.tran@tiny.cloud>
Co-authored-by: Mitchell Crompton <mitchell.crompton@tiny.cloud>

Author: 3 people

modules/ROOT/examples/live-demos/comments-callback-with-mentions/index.html

@@ -7,7 +7,7 @@ <h2>Welcome to Tiny Comments!</h2>
   <li>Type your comment into the text field at the bottom of the Comment sidebar, and use <code>@</code> followed by a name to mention a collaborator.</li>
   <li>Click <strong>Comment</strong>.</li>
 </ol>
-<p>Your comment is <span class="mce-annotation tox-comment" data-mce-annotation-uid="mce-conversation_420304606321716900864126" data-mce-annotation="tinycomments">then</span> attached to the text, <span class="mce-annotation tox-comment" data-mce-annotation-uid="mce-conversation_19679600221621399703915" data-mce-annotation="tinycomments">exactly like this!</span> You can <span class="mymention" style="color: #37F;" data-mention-id="jennynichols" data-mce-mentions-id="jennynichols">@Jenny Nichols</span> directly in your comments to notify them.</p>
+<p>Your comment is <span class="mce-annotation tox-comment" data-mce-annotation-uid="mce-conversation_19679600221621399703915" data-mce-annotation="tinycomments">then</span> attached to the text, <span class="mce-annotation tox-comment" data-mce-annotation-uid="mce-conversation_420304606321716900864126" data-mce-annotation="tinycomments">exactly like this!</span> You can <span class="mymention" style="color: gray;" data-mention-id="mia-andersson" data-mce-mentions-id="mia-andersson">@Mia Andersson</span> directly in your comments to notify them.</p>
 <p>If you want to take Tiny Comments for a test drive in your own environment, Tiny Comments is one of the premium plugins you can try for free for 14 days by signing up for a Tiny account. Make sure to check out our documentation as well.</p>
 <h2>A simple table to play with</h2>
 <table style="border-collapse: collapse; width: 100%;" border="1">
@@ -29,4 +29,4 @@ <h2>A simple table to play with</h2>
   </tbody>
 </table>
 <p>Thanks for supporting TinyMCE! We hope it helps your users create great content.</p>
-</textarea>
+</textarea>