vim-patch:31ec664: runtime(doc): Update help syntax, match :autocmd options (#35008)

- Match :autocmd options and special buffer pattern.
- Normalise ellipsis (three dots) in Ex command argument lists.

closes: vim/vim#17793

31ec66403d

Co-authored-by: Doug Kearns <dougkearns@gmail.com>

runtime/doc/editing.txt

@@ -630,7 +630,7 @@ list of the current window.
 			buffer.
 			Also see |++opt| and |+cmd|.
 
-:[count]arge[dit][!] [++opt] [+cmd] {name} ..		*:arge* *:argedit*
+:[count]arge[dit][!] [++opt] [+cmd] {name} ...		*:arge* *:argedit*
 			Add {name}s to the argument list and edit it.
 			There is no check for duplicates, it is possible to
 			add a file to the argument list twice |:argded|.
@@ -645,7 +645,7 @@ list of the current window.
 			edited. No check for duplicates is done.
 			Also see |++opt| and |+cmd|.
 
-:[count]arga[dd] {name} ..			*:arga* *:argadd* *E479*
+:[count]arga[dd] {name} ...			*:arga* *:argadd* *E479*
 :[count]arga[dd]						*E1156*
 			Add the {name}s to the argument list.  When {name} is
 			omitted add the current buffer name to the argument
@@ -676,7 +676,7 @@ list of the current window.
 			If your current file is a duplicate, your current file
 			will change to the original file index.
 
-:argd[elete] {pattern} ..		*:argd* *:argdelete* *E480* *E610*
+:argd[elete] {pattern} ...		*:argd* *:argdelete* *E480* *E610*
 			Delete files from the argument list that match the
 			{pattern}s.  {pattern} is used like a file pattern,
 			see |file-pattern|.  "%" can be used to delete the

runtime/doc/syntax.txt

@@ -3825,13 +3825,13 @@ SYNTAX ISKEYWORD SETTING				*:syn-iskeyword*
 
 DEFINING KEYWORDS					*:syn-keyword*
 
-:sy[ntax] keyword {group-name} [{options}] {keyword} .. [{options}]
+:sy[ntax] keyword {group-name} [{options}] {keyword} ... [{options}]
 
 	This defines a number of keywords.
 
 	{group-name}	Is a syntax group name such as "Comment".
 	[{options}]	See |:syn-arguments| below.
-	{keyword} ..	Is a list of keywords which are part of this group.
+	{keyword} ...	Is a list of keywords which are part of this group.
 
 	Example: >
   :syntax keyword   Type   int long char

runtime/doc/vimeval.txt

@@ -2460,7 +2460,7 @@ text...
 			line and not see the "|" that separates the commands.
 
 							*:ec* *:echo*
-:ec[ho] {expr1} ..	Echoes each {expr1}, with a space in between.  The
+:ec[ho] {expr1} ...	Echoes each {expr1}, with a space in between.  The
 			first {expr1} starts on a new line.
 			Also see |:comment|.
 			Use "\n" to start a new line.  Use "\r" to move the
@@ -2493,7 +2493,7 @@ text...
 			level.
 
 							*:echon*
-:echon {expr1} ..	Echoes each {expr1}, without anything added.  Also see
+:echon {expr1} ...	Echoes each {expr1}, without anything added.  Also see
 			|:comment|.
 			Uses the highlighting set by the `:echohl` command.
 			Cannot be followed by a comment.
@@ -2524,7 +2524,7 @@ text...
 			otherwise all following echo's will be highlighted.
 
 							*:echom* *:echomsg*
-:echom[sg] {expr1} ..	Echo the expression(s) as a true message, saving the
+:echom[sg] {expr1} ...	Echo the expression(s) as a true message, saving the
 			message in the |message-history|.
 			Spaces are placed between the arguments as with the
 			`:echo` command.  But unprintable characters are
@@ -2539,8 +2539,9 @@ text...
 		:echomsg "It's a Zizzer Zazzer Zuzz, as you can plainly see."
 <			See |:echo-redraw| to avoid the message disappearing
 			when the screen is redrawn.
+
 							*:echoe* *:echoerr*
-:echoe[rr] {expr1} ..	Echo the expression(s) as an error message, saving the
+:echoe[rr] {expr1} ...	Echo the expression(s) as an error message, saving the
 			message in the |message-history|.  When used in a
 			script or function the line number will be added.
 			Spaces are placed between the arguments as with the
@@ -2572,7 +2573,7 @@ text...
 
 
 							*:exe* *:execute*
-:exe[cute] {expr1} ..	Executes the string that results from the evaluation
+:exe[cute] {expr1} ...	Executes the string that results from the evaluation
 			of {expr1} as an Ex command.
 			Multiple arguments are concatenated, with a space in
 			between.  To avoid the extra space use the ".."

runtime/syntax/help.vim

@@ -108,6 +108,7 @@ syn match helpSpecial		"^\t[>enf{}^L:=lbghNEpti+cC/(uUwWkmMjJ)*#P]N\s"ms=s+2,me=
 syn match helpSpecial		"{[-_a-zA-Z0-9'"*+/:%#=[\]<>.,]\+}"
 syn match helpSpecial		"\s\[[-a-z^A-Z0-9_]\{2,}]"ms=s+1
 syn match helpSpecial		"<[-a-zA-Z0-9_]\+>"
+syn match helpSpecial		"<buffer=\w\+>"
 syn match helpSpecial		"<[SCM]-.>"
 syn match helpNormal		"<---*>"
 syn match helpSpecial		"\[range]"
@@ -120,6 +121,9 @@ syn match helpSpecial		"\[+num]"
 syn match helpSpecial		"\[-num]"
 syn match helpSpecial		"\[+cmd]"
 syn match helpSpecial		"\[++opt]"
+syn match helpSpecial		"\[++once]"
+syn match helpSpecial		"\[++nested]"
+syn match helpSpecial		"\[++t]"
 syn match helpSpecial		"\[arg]"
 syn match helpSpecial		"\[arguments]"
 syn match helpSpecial		"\[ident]"