Demote existing heading so the precedence makes sense

doc/todo/supporting_comments_via_disussion_pages.mdwn

@@ -45,7 +45,7 @@ Is this simple enough to be sensible?
 
 >>> As a side note, the feature described above (having a form not to add a page but to expand it in a formated way) would be useful for other things when the content is short (timetracking, sub-todo list items, etc..) --[[hb]]
 
-## [[MarceloMagallon]]'s implementation
+# [[MarceloMagallon]]'s implementation
 
 I've been looking into this.  I'd like to implement a "blogcomments"
 plugin.  Looking at the code, I think the way to go is to have a
@@ -82,7 +82,7 @@ Each comment is processed to something like this:
 
 -- [[MarceloMagallon]]
 
-# Code
+## Code
 
     #!/usr/bin/perl
     package IkiWiki::Plugin::comments;
@@ -163,7 +163,7 @@ Each comment is processed to something like this:
     
     1;
 
-## [[smcv]]'s implementation
+# [[smcv]]'s implementation
 
 I've started a smcvpostcomment plugin (to be renamed to postcomment if people like it, but I'm namespacing it while it's still experimental) which I think more closely resembles what Joey was after. The code is cargo-culted from a mixture of editpage and inline's "make a blog post" support - it has to use a lot of semi-internal IkiWiki:: functions (both of those plugins do too). It doesn't fully work yet, but I'll try to get it into a state where it basically works and can be published in the next week or two.