doc/howto_release.txt: update links to point to new dot-release

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@67796 15284696-431f-4ddb-bdfa-cd5b030d7da7

doc/howto_release.txt

@@ -156,6 +156,9 @@ Contents
 
      full release:
       - update trac milesstone/add next: https://trac.osgeo.org/grass/admin/ticket/milestones
+      - update links to point to new dot-release
+              https://wingrass.fsv.cvut.cz/grass70/x86/addons/latest
+              https://wingrass.fsv.cvut.cz/grass70/x86_64/addons/latest
 
  o upload user HTML manual in case of *final release* from compiled English
    version at (warning: needs stuff to be compiled).