Fix #520

To fix expression in the help doc for more clarity.

Author: tacahiroy

autoload/ctrlp/mixed.vim

@@ -65,7 +65,7 @@ fu! s:getnewmix(cwd, clim)
 		cal sort(g:ctrlp_lines, 'ctrlp#complen')
 	en
 	" remove duplicates from the final result set
-  let g:ctrlp_lines=filter(copy(g:ctrlp_lines), 'index(g:ctrlp_lines, v:val, v:key+1)==-1')
+	let g:ctrlp_lines=filter(copy(g:ctrlp_lines), 'index(g:ctrlp_lines, v:val, v:key+1)==-1')
 	let g:ctrlp_allmixes = { 'filtime': getftime(ctrlp#utils#cachefile()),
 		\ 'mrutime': getftime(ctrlp#mrufiles#cachefile()), 'cwd': a:cwd,
 		\ 'bufs': len(ctrlp#mrufiles#bufs()), 'data': g:ctrlp_lines }

doc/ctrlp.txt

@@ -1107,13 +1107,13 @@ c)  End the string with a colon ':' followed by a Vim command to execute that
 
     See also: Vim's |++opt| and |+cmd|.
 
-d)  Submit two dots '..' to go upward the directory tree by 1 level. To go up
+d)  Input two dots '..' and then hit the <Enter> key to go upward the directory tree by 1 level. To go up
     multiple levels, use one extra dot for each extra level:
 >
          Raw input    Interpreted as
-         ..           ../
-         ...          ../../
-         ....         ../../../
+         ..<Cr>           ../
+         ...<Cr>          ../../
+         ....<Cr>         ../../../
 <
     Note: if the parent directories are large and uncached, this can be slow.