patch 8.2.3268: cannot use a block with :autocmd like with :command

Problem:    Cannot use a block with :autocmd like with :command.
Solution:   Add support for a {} block after :autocmd. (closes #8620)
diff --git a/runtime/doc/autocmd.txt b/runtime/doc/autocmd.txt
index 7614e8b..d3ebc11 100644
--- a/runtime/doc/autocmd.txt
+++ b/runtime/doc/autocmd.txt
@@ -76,6 +76,12 @@
 script.  Thus this depends on where the autocmd is defined, not where it is
 triggered.
 
+{cmd} can use a block, like with `:command`, see |:command-repl|.  Example: >
+	au BufReadPost *.xml {
+		  setlocal matchpairs+=<:>
+		  /<start
+		}
+
 Note: The ":autocmd" command can only be followed by another command when the
 '|' appears before {cmd}.  This works: >
 	:augroup mine | au! BufRead | augroup END