remove two template variables

Drop __SHORT_SUMMARY__ and __STABLE_WARNING__.  The former provides no
interesting information (just a list of installed files); the latter
seems no longer used and nobody missed it so far.
Signed-off-by: NAnsgar Burchardt <ansgar@debian.org>

templates/README

@@ -29,8 +29,6 @@ Misc
  o __BUG_NUMBER__
  o __CONTROL_MESSAGE__
  o __MANUAL_REJECT_MESSAGE__
- o __SHORT_SUMMARY__
  o __SUMMARY__
- o __STABLE_WARNING__
  o __SUITE__
 

templates/process-unchecked.announce

@@ -9,6 +9,3 @@ Content-Transfer-Encoding: 8bit
 Subject: Accepted __SOURCE__ __VERSION__ (__ARCHITECTURE__)
 
 __FILE_CONTENTS__
-
-Accepted:
-__SHORT_SUMMARY__

templates/process-unchecked.bug-close

@@ -12,10 +12,7 @@ Source: __SOURCE__
 Source-Version: __VERSION__
 
 We believe that the bug you reported is fixed in the latest version of
-__SOURCE__, which is due to be installed in the __DISTRO__ FTP archive:
-
-__SHORT_SUMMARY__
-__STABLE_WARNING__
+__SOURCE__, which is due to be installed in the __DISTRO__ FTP archive.
 
 A summary of the changes between this version and the previous one is
 attached.