Show how to set up fzf#vim#files with fzf#vim#with_preview

doc/fzf-vim.txt

@@ -160,11 +160,6 @@ Global options~
 Command-local options~
 
 >
-    " [Files] Extra options for fzf
-    "         e.g. File preview using coderay (http://coderay.rubychan.de/)
-    let g:fzf_files_options =
-      \ '--preview "(coderay {} || cat {}) 2> /dev/null | head -'.&lines.'"'
-
     " [Buffers] Jump to the existing window if possible
     let g:fzf_buffers_jump = 1
 
@@ -212,6 +207,10 @@ You can use autoload functions to define your own commands.
       \   <bang>0 ? fzf#vim#with_preview('up:60%')
       \           : fzf#vim#with_preview('right:50%:hidden', '?'),
       \   <bang>0)
+
+    " Likewise, Files command with preview window
+    command! -bang -nargs=? -complete=dir Files
+      \ call fzf#vim#files(<q-args>, fzf#vim#with_preview(), <bang>0)
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