Remove NEWS entry for 2.9.4

Remove the NEWS entry for 2.9.4 temporarily until it actually gets
released. Otherwise check-news would complain about the unreleased
version below released ones.

The NEWS entry will be added back once 2.9.4 is released and the
corresponding commits are merged up to 2.10 again.
Signed-off-by: Thomas Thrainer <thomasth@google.com>
Reviewed-by: Hrvoje Ribicic <riba@google.com>

NEWS

@@ -166,16 +166,6 @@ before rc1.
 - Issue 623: IPv6 Masterd <-> Luxid communication error
 
 
-Version 2.9.4
--------------
-
-*(unreleased)*
-
-- Fix the RAPI instances-multi-alloc call
-- assign unique filenames to file-based disks
-- gracefully handle degraded non-diskless instances with 0 disks (issue 697)
-
-
 Version 2.9.3
 -------------