fix internal links for ansible forum (#1052)

Author: akira6592

docs/docsite/rst/community/communication.rst

@@ -215,7 +215,7 @@ The Bullhorn
 ============
 
 **The Bullhorn** is our newsletter for the Ansible contributor community. You can get Bullhorn updates
-from the :ref:`forum` or `subscribe <https://eepurl.com/gZmiEP>`_ to receive it.
+from the :ref:`ansible_forum` or `subscribe <https://eepurl.com/gZmiEP>`_ to receive it.
 
 If you have any questions or content you would like to share, you are welcome to chat with us
 in the `Ansible Social room on Matrix<https://matrix.to/#/#social:ansible.com>, and mention
@@ -229,7 +229,7 @@ Asking questions over email
 
 .. note::
 
-  This form of communication is deprecated. Consider using the :ref:`forum` instead.
+  This form of communication is deprecated. Consider using the :ref:`ansible_forum` instead.
 
 Your first post to the mailing list will be moderated (to reduce spam), so please allow up to a day or so for your first post to appear.
 

docs/docsite/rst/installation_guide/intro_installation.rst

@@ -362,7 +362,7 @@ See the `argcomplete documentation <https://kislyuk.github.io/argcomplete/>`_.
        Learning ansible's configuration management language
    :ref:`installation_faqs`
        Ansible Installation related to FAQs
-   :ref:`forum`
+   :ref:`ansible_forum`
        Join the Ansible community forum to get help and share insights
    :ref:`communication_irc`
        How to join Ansible chat channels