AutoRegen.sh: update reference to documentation
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171037 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/autoconf/AutoRegen.sh b/autoconf/AutoRegen.sh
index 7809667..cbca738 100755
--- a/autoconf/AutoRegen.sh
+++ b/autoconf/AutoRegen.sh
@@ -13,7 +13,7 @@
### These variables specify the tool versions we want to use.
### Periods should be escaped with backslash for use by grep.
###
-### If you update these, please also update docs/GettingStarted.html
+### If you update these, please also update docs/GettingStarted.rst
want_autoconf_version='2\.60'
want_autoheader_version=$want_autoconf_version
want_aclocal_version='1\.9\.6'