Fixed #14633 - Organized settings reference docs and added a topical index.

Thanks Gabriel Hurley for the original idea
and adamv for the draft patch.

docs/ref/contrib/comments/index.txt

@@ -34,7 +34,8 @@ To get started using the ``comments`` app, follow these steps:
 #. Use the `comment template tags`_ below to embed comments in your
    templates.
 
-You might also want to examine :doc:`/ref/contrib/comments/settings`.
+You might also want to examine :ref:`the available settings
+<settings-comments>`.
 
 Comment template tags
 =====================
@@ -335,6 +336,13 @@ output the CSRF token and cookie.
 
 .. _honeypot: http://en.wikipedia.org/wiki/Honeypot_(computing)
 
+
+Configuration
+=============
+
+See :ref:`comment settings <settings-comments>`.
+
+
 More information
 ================
 
@@ -342,7 +350,6 @@ More information
    :maxdepth: 1
 
    models
-   settings
    signals
    custom
    forms

docs/ref/contrib/comments/settings.txt

@@ -1,33 +0,0 @@
-================
-Comment settings
-================
-
-These settings configure the behavior of the comments framework:
-
-.. setting:: COMMENTS_HIDE_REMOVED
-
-COMMENTS_HIDE_REMOVED
----------------------
-
-If ``True`` (default), removed comments will be excluded from comment
-lists/counts (as taken from template tags). Otherwise, the template author is
-responsible for some sort of a "this comment has been removed by the site staff"
-message.
-
-.. setting:: COMMENT_MAX_LENGTH
-
-COMMENT_MAX_LENGTH
-------------------
-
-The maximum length of the comment field, in characters. Comments longer than
-this will be rejected. Defaults to 3000.
-
-.. setting:: COMMENTS_APP
-
-COMMENTS_APP
-------------
-
-An app which provides :doc:`customization of the comments framework
-</ref/contrib/comments/custom>`.  Use the same dotted-string notation
-as in :setting:`INSTALLED_APPS`.  Your custom :setting:`COMMENTS_APP`
-must also be listed in :setting:`INSTALLED_APPS`.