patch 9.1.0547: No way to get the arity of a Vim function

Problem:  No way to get the arity of a Vim function
          (Austin Ziegler)
Solution: Enhance get() Vim script function to return the function
          argument info using get(func, "arity") (LemonBoy)

fixes: #15097
closes: #15109

Signed-off-by: LemonBoy <thatlemon@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/version9.txt b/runtime/doc/version9.txt
index 92792b9..43de269 100644
--- a/runtime/doc/version9.txt
+++ b/runtime/doc/version9.txt
@@ -1,4 +1,4 @@
-*version9.txt*  For Vim version 9.1.  Last change: 2024 Jul 06
+*version9.txt*  For Vim version 9.1.  Last change: 2024 Jul 08
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -41577,6 +41577,8 @@
 - 'nrformat' accepts the new "blank" suboption, to determine a signed or
   unsigned number based on whitespace in front of a minus sign.
 - allow to specify a priority when defining a new sign |:sign-define|
+- provide information about function arguments using the get(func, "arity")
+  function |get()-func|
 
 							*added-9.2*
 Added ~