patch 8.2.4136: Vim9: the "autoload" argument of ":vim9script" is not useful

Problem:    Vim9: the "autoload" argument of ":vim9script" is not useful.
Solution:   Remove the argument. (closes #9555)
diff --git a/runtime/doc/repeat.txt b/runtime/doc/repeat.txt
index 067234a..9a82ba4 100644
--- a/runtime/doc/repeat.txt
+++ b/runtime/doc/repeat.txt
@@ -365,12 +365,11 @@
 			Vim version, or update Vim to a newer version.  See
 			|vimscript-version| for what changed between versions.
 
-:vim9s[cript] [noclear] [autoload]			*:vim9s* *:vim9script*
+:vim9s[cript] [noclear]				*:vim9s* *:vim9script*
 			Marks a script file as containing |Vim9-script|
 			commands.  Also see |vim9-namespace|.
 			Must be the first command in the file.
 			For [noclear] see |vim9-reload|.
-			For [autoload] see |vim9-autoload|.
 			Without the |+eval| feature this changes the syntax
 			for some commands.
 			See |:vim9cmd| for executing one command with Vim9
@@ -378,8 +377,8 @@
 
 						*:scr* *:scriptnames*
 :scr[iptnames]		List all sourced script names, in the order they were
-			first sourced.  The number is used for the script ID
-			|<SID>|.
+			first encountered.  The number is used for the script
+			ID |<SID>|.
 			For a script that was used with `import autoload` but
 			was not actually sourced yet an "A" is shown after the
 			script ID.
diff --git a/runtime/doc/vim9.txt b/runtime/doc/vim9.txt
index 94a5057..bbdc2bd 100644
--- a/runtime/doc/vim9.txt
+++ b/runtime/doc/vim9.txt
@@ -1,4 +1,4 @@
-*vim9.txt*	For Vim version 8.2.  Last change: 2022 Jan 15
+*vim9.txt*	For Vim version 8.2.  Last change: 2022 Jan 18
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -1523,17 +1523,18 @@
    directory.
 
 2. In the autoload script put the bulk of the code. >
-	vim9script autoload
+	vim9script
 	export def Stuff(arg: string)
 	  ...
 
 <   This goes in .../autoload/for/search.vim.
 
-   Adding "autoload" to `:vim9script` has the effect that "for#search#" will
-   be prefixed to every exported item.  The prefix is obtained from the file
-   name, as you would to manually in a legacy autoload script.  Thus the
-   exported function can be found with "for#search#Stuff", but you would
-   normally use `import autoload` and not need to specify the prefix.
+   Putting the "search.vim" script under the "/autoload/for/" directory has
+   the effect that "for#search#" will be prefixed to every exported item.  The
+   prefix is obtained from the file name, as you would to manually in a
+   legacy autoload script.  Thus the exported function can be found with
+   "for#search#Stuff", but you would normally use `import autoload` and not
+   use the prefix.
 
    You can split up the functionality and import other scripts from the
    autoload script as you like.  This way you can share code between plugins.