runtime(help): Update help syntax

This commit makaes the following changes to the vim help syntax:

- fix excessive URL detection in help, because `file:{filename}` in
  doc/options.txt is determined to be a URL.
- update highlighting N for :resize in help
- split Italian-specific syntax into separate help script
- highlight `Note` in parentheses in help
- update 'titlestring' behaviour in documentation for invalid '%' format

closes: #15883

Signed-off-by: Milly <milly.ca@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/doc/builtin.txt

@@ -1,4 +1,4 @@
-*builtin.txt*	For Vim version 9.1.  Last change: 2024 Oct 14
+*builtin.txt*	For Vim version 9.1.  Last change: 2024 Oct 16
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -11954,7 +11954,7 @@ wildmenumode()					*wildmenumode()*
 		For example to make <c-j> work like <down> in wildmode, use: >
     :cnoremap <expr> <C-j> wildmenumode() ? "\<Down>\<Tab>" : "\<c-j>"
 <
-		(Note, this needs the 'wildcharm' option set appropriately).
+		(Note: this needs the 'wildcharm' option set appropriately).
 
 		Return type: |Number|
 

runtime/doc/options.txt

@@ -1,4 +1,4 @@
-*options.txt*	For Vim version 9.1.  Last change: 2024 Oct 14
+*options.txt*	For Vim version 9.1.  Last change: 2024 Oct 16
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -8705,7 +8705,9 @@ A jump table for the options with a short description can be found at |Q_op|.
 	be restored if possible, see |X11|.
 
 	When this option contains printf-style '%' items, they will be
-	expanded according to the rules used for 'statusline'.
+	expanded according to the rules used for 'statusline'.  If it contains
+	an invalid '%' format, the value is used as-is and no error or warning
+	will be given when the value is set.
 	This option cannot be set in a modeline when 'modelineexpr' is off.
 
 	Example: >