Remove obsolete documentation

Author: tpope

doc/rails.txt

@@ -670,13 +670,6 @@ Cream, the user friendly editor which uses Vim as a back-end.  Ctrl+Enter
 finds the file under the cursor (as in |rails-gf|), and Alt+[ and Alt+] find
 the alternate (|rails-alternate|) and related (|rails-related|) files.
 
-						*rails-template-types*
-Commands like :Rview use a hardwired list of extensions (erb, rjs, etc.)
-when searching for files.  In order to facilitate working with non-standard
-template types, several popular extensions are featured in this list,
-including haml, liquid, and mab (markaby).  These extensions will disappear
-once a related configuration option is added to rails.vim.
-
 						*rails-rspec*
 The presence of a spec directory causes several additional behaviors to
 activate.  :A knows about specs and will jump to them (but Test::Unit files