Update dead support link (#22212)

* Update dead support link

Visit https://www.ansible.com/, and you'll find the support link points to this URL, https://access.redhat.com/products/ansible-tower-red-hat/.

The current link is a dead link.

* update github code blocks link

docs/docsite/rst/community.rst

@@ -77,7 +77,7 @@ To be respectful of reviewers' time and allow us to help everyone efficiently, p
 provide minimal well-reduced and well-commented examples versus sharing your entire production
 playbook.  Include playbook snippets and output where possible.  
 
-When sharing YAML in playbooks, formatting can be preserved by using `code blocks <https://help.github.com/articles/github-flavored-markdown#fenced-code-blocks>`_.
+When sharing YAML in playbooks, formatting can be preserved by using `code blocks <https://help.github.com/articles/creating-and-highlighting-code-blocks/>`_.
 
 For multiple-file content, we encourage use of gist.github.com.  Online pastebin content can expire, so it's nice to have things around for a longer term if they
 are referenced in a ticket.
@@ -248,7 +248,7 @@ Tower Support Questions
 
 Ansible `Tower <https://ansible.com/tower>`_ is a UI, Server, and REST endpoint for Ansible, produced by Ansible, Inc.
 
-If you have a question about Tower, visit `support.ansible.com <https://support.ansible.com/>`_ rather than using the IRC
+If you have a question about Tower, visit `Red Hat support <https://access.redhat.com/products/ansible-tower-red-hat/>`_ rather than using the IRC
 channel or the general project mailing list.
 
 IRC Channel