doc/howto_release.txt: rm leftover demolocation/PERMANENT/.bash* files

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@70934 15284696-431f-4ddb-bdfa-cd5b030d7da7

doc/howto_release.txt

@@ -39,6 +39,7 @@ Contents
    - cleanup rubbish:
        rm -f locale/templates/*.pot
        rm -f locale/po/messages.mo
+       rm -f demolocation/PERMANENT/.bash*
        find . -name '*~'     | xargs rm
        find . -name '*.bak'  | xargs rm
        find . -name '.#*'    | xargs rm