patch 8.2.5000: no patch for documentation updates

Problem:    No patch for documentation updates.
Solution:   Update documentation files.
diff --git a/runtime/doc/vim9.txt b/runtime/doc/vim9.txt
index 479edc5..069dac4 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 May 13
+*vim9.txt*	For Vim version 8.2.  Last change: 2022 May 21
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar