patch 9.1.0774: "shellcmdline" doesn't work with getcompletion()

Problem:  "shellcmdline" doesn't work with getcompletion().
Solution: Use set_context_for_wildcard_arg() (zeertzjq).

closes: #15834

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 880dfcd..44e9ee0 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -1,4 +1,4 @@
-*builtin.txt*	For Vim version 9.1.  Last change: 2024 Oct 08
+*builtin.txt*	For Vim version 9.1.  Last change: 2024 Oct 09
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -4091,7 +4091,7 @@
 		cscope		|:cscope| suboptions
 		custom,{func}	custom completion, defined via {func}
 		customlist,{func} custom completion, defined via {func}
-		diff_buffer     |:diffget| and |:diffput| completion
+		diff_buffer	|:diffget| and |:diffput| completion
 		dir		directory names
 		dir_in_path	directory names in |'cdpath'|
 		environment	environment variable names
@@ -4115,6 +4115,7 @@
 		runtime		|:runtime| completion
 		scriptnames	sourced script names |:scriptnames|
 		shellcmd	Shell command
+		shellcmdline	Shell command line with filename arguments
 		sign		|:sign| suboptions
 		syntax		syntax file names |'syntax'|
 		syntime		|:syntime| suboptions