Update runtime files

runtime/doc/indent.txt

@@ -1,4 +1,4 @@
-*indent.txt*    For Vim version 8.2.  Last change: 2019 Dec 07
+*indent.txt*    For Vim version 8.2.  Last change: 2022 Jan 31
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -778,6 +778,15 @@ You can set the indent for the first line after <script> and <style>
       "auto"	auto indent (same indent as the blocktag)
       "inc"	auto indent + one indent step
 
+You can set the indent for attributes after an open <tag line: >
+
+      :let g:html_indent_attribute = 1
+<
+      VALUE	MEANING ~
+      1		auto indent, one indent step more than <tag
+      2		auto indent, two indent steps (default)
+      > 2	auto indent, more indent steps
+
 Many tags increase the indent for what follows per default (see "Add Indent
 Tags" in the script).  You can add further tags with: >