docs: updated references for rhodecode extensions

docs/admin/repo-extra-fields.rst

@@ -7,7 +7,7 b' Extra fields attached to a |repo| allow '
 each repository. This allows storing custom data per-repository.
 
 It can be used in :ref:`integrations-webhook` or in |RCX|.
-To install and read more about |RCX|, see the :ref:`install-rcx` section.
+To read more about |RCX|, see the :ref:`integrations-rcextensions` section.
 
 
 Enabling Extra Fields

docs/admin/repo-hooks.rst

@@ -46,11 +46,6 b' This is the complete list of |repos| hoo'
 Using Repository Hooks
 ----------------------
 
-To use these hooks you need to install |RCX|. For more information, see the
-:ref:`install-rcx` section.
+To use these hooks you need to setup |RCX|. For more information, see the
+:ref:`integrations-rcextensions` section.
 
-Creating Extensions
--------------------
-
-To create your own extensions using these hooks, see the :ref:`dev-plug`
-section.