Updated runtime files.

runtime/doc/helphelp.txt

@@ -1,4 +1,4 @@
-*helphelp.txt*	For Vim version 8.0.  Last change: 2016 Apr 01
+*helphelp.txt*	For Vim version 8.0.  Last change: 2017 Feb 09
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -28,10 +28,16 @@ Help on help files					*helphelp*
 
 						*{subject}* *E149* *E661*
 :h[elp] {subject}	Like ":help", additionally jump to the tag {subject}.
-			{subject} can include wildcards like "*", "?" and
+			For example:  >
+				:help options
+
+<			{subject} can include wildcards such as "*", "?" and
 			"[a-z]":
 			   :help z?	jump to help for any "z" command
 			   :help z.	jump to the help for "z."
+			But when a tag exists it is taken literally:
+			   :help :?	jump to help for ":?"
+
 			If there is no full match for the pattern, or there
 			are several matches, the "best" match will be used.
 			A sophisticated algorithm is used to decide which
@@ -68,18 +74,19 @@ Help on help files					*helphelp*
 			example to find help for CTRL-V in Insert mode: >
 				:help i^V
 <
-			To use a regexp |pattern|, first do ":help" and then
+			It is also possible to first do ":help" and then
 			use ":tag {pattern}" in the help window.  The
 			":tnext" command can then be used to jump to other
 			matches, "tselect" to list matches and choose one. >
-				:help index| :tse z.
+				:help index
+				:tselect /.*mode
 
 <			When there is no argument you will see matches for
 			"help", to avoid listing all possible matches (that
 			would be very slow).
 			The number of matches displayed is limited to 300.
 
-			This command can be followed by '|' and another
+			The `:help` command can be followed by '|' and another
 			command, but you don't need to escape the '|' inside a
 			help command.  So these both work: >
 				:help |