runtime(doc): Improve :help :ls description formatting

Quote the special buffer names for consistency (see :help bufname()) and
so that they're not incorrectly highlighted as optional command
arguments.

closes: #18730

Signed-off-by: Doug Kearns <[email protected]>
Signed-off-by: Christian Brabandt <[email protected]>

Author: dkearns

runtime/doc/windows.txt

@@ -1,4 +1,4 @@
-*windows.txt*	For Vim version 9.1.  Last change: 2025 Nov 10
+*windows.txt*	For Vim version 9.1.  Last change: 2025 Nov 11
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -1145,10 +1145,10 @@ list of buffers. |unlisted-buffer|
 		or "N CTRL-^", where N is the buffer number.
 
 		For the file name these special values are used:
-			[Prompt]	|prompt-buffer|
-			[Popup]		buffer of a |popup-window|
-			[Scratch]	'buftype' is "nofile"
-			[No Name]	no file name specified
+			"[Prompt]"	|prompt-buffer|
+			"[Popup]"	buffer of a |popup-window|
+			"[Scratch]"	'buftype' is "nofile"
+			"[No Name]"	no file name specified
 		For a |terminal-window| buffer the status is used.
 
 		Indicators (chars in the same column are mutually exclusive):