[doc]Fix inaccurate url links in docs

This is to fix some inaccurate url links in docs.

Change-Id: I7426cf186c0917bd9851f71262d85dd5892f5ea6

HACKING.rst

@@ -65,10 +65,10 @@ Release Notes
 
   * Generate a release notes page
      1. tox -e venv -- reno new {my-new-feature}
-     2. https://docs.openstack.org/reno/latest/user/index.html#creating-new-release-notes
+     2. https://docs.openstack.org/reno/latest/user/usage.html#creating-new-release-notes
 
   * Update/Edit an existing release note
-     1. https://docs.openstack.org/reno/latest/user/index.html#editing-a-release-note
+     1. https://docs.openstack.org/reno/latest/user/usage.html#editing-a-release-note
 
 
 - Building release notes::