patch 8.0.1845: various comment updates needed, missing white space

Problem:    Various comment updates needed, missing white space.
Solution:   Update comments, add white space.
diff --git a/runtime/doc/cmdline.txt b/runtime/doc/cmdline.txt
index d7a0261..d1f949d 100644
--- a/runtime/doc/cmdline.txt
+++ b/runtime/doc/cmdline.txt
@@ -1,4 +1,4 @@
-*cmdline.txt*   For Vim version 8.0.  Last change: 2018 May 10
+*cmdline.txt*   For Vim version 8.0.  Last change: 2018 May 14
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -458,6 +458,10 @@
 '?' are accepted when matching file names.  '*' matches any string, '?'
 matches exactly one character.
 
+When repeating 'wildchar' or CTRL-N you cycle through the matches, eventually
+ending up back to what was typed.  If the first match is not what you wanted,
+you can use <S-Tab> or CTRL-P to go straight back to what you typed.
+
 The 'wildignorecase' option can be set to ignore case in filenames.
 
 The 'wildmenu' option can be set to show the matches just above the command