patch 9.1.0741: No way to get prompt for input()/confirm()

Problem:  No way to get prompt for input()/confirm()
Solution: add getcmdprompt() function (Shougo Matsushita)
          (Shougo Matsushita)

closes: #15667

Signed-off-by: Shougo Matsushita <Shougo.Matsu@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/usr_41.txt b/runtime/doc/usr_41.txt
index 765eab5..27df85a 100644
--- a/runtime/doc/usr_41.txt
+++ b/runtime/doc/usr_41.txt
@@ -1,4 +1,4 @@
-*usr_41.txt*	For Vim version 9.1.  Last change: 2024 Jun 09
+*usr_41.txt*	For Vim version 9.1.  Last change: 2024 Sep 23
 
 		     VIM USER MANUAL - by Bram Moolenaar
 
@@ -1070,7 +1070,8 @@
 Command line:					*command-line-functions*
 	getcmdcompltype()	get the type of the current command line
 				completion
-	getcmdline()		get the current command line
+	getcmdline()		get the current command line input
+	getcmdprompt()		get the current command line prompt
 	getcmdpos()		get position of the cursor in the command line
 	getcmdscreenpos()	get screen position of the cursor in the
 				command line