rdoc links to symbols not rendered into html properly

The html generated by rdoc for rails is incorrrect when processing a link to a symbol.

For example the rdoc in the source file:

activerecord/lib/active_record/base.rb

for the with_scope method has this section:

  # *Note*: the +:find+ scope also has effect on update and deletion methods,
  # like +update_all+ and +delete_all+.

Rdoc creates links for all three terms bracketed by "+" characters but the html generated for:

  +:find+

looks like this:

  +:<a href="Base.html#M001977">find</a>+

instead of this:

  <a href="Base.html#M001977">:find</a>

The html rendered for the entire paragraph looks like this:

  <p>
  <b>Note</b>: the +:<a href="Base.html#M001977">find</a>+ scope also has
  effect on <a href="Base.html#M001984">update</a> and deletion methods, like
  <tt><a href="Base.html#M001987">update_all</a></tt> and <tt><a
  href="Base.html#M001989">delete_all</a></tt>.
  </p>