runtime(doc): add preview flag to statusline example

Problem:  The standard statusline example is missing the preview flag
          "%w"
Solution: Add the preview flag "%w"

closes: #15874

Signed-off-by: saher <msaher.shair@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: msaher

runtime/doc/options.txt

@@ -1,4 +1,4 @@
-*options.txt*	For Vim version 9.1.  Last change: 2024 Oct 06
+*options.txt*	For Vim version 9.1.  Last change: 2024 Oct 14
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -7969,7 +7969,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 
 	Examples:
 	Emulate standard status line with 'ruler' set >
-	  :set statusline=%<%f\ %h%m%r%=%-14.(%l,%c%V%)\ %P
+	  :set statusline=%<%f\ %h%w%m%r%=%-14.(%l,%c%V%)\ %P
 <	Similar, but add ASCII value of char under the cursor (like "ga") >
 	  :set statusline=%<%f%h%m%r%=%b\ 0x%B\ \ %l,%c%V\ %P
 <	Display byte count and byte value, modified flag in red. >