[release/HEAD 2/2] Update gdb/NEWS after GDB 18 branch creation.

This commit a new section for the next release branch, and renames
the section of the current branch, now that it has been cut.
---
 gdb/NEWS | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gdb/NEWS b/gdb/NEWS
index 8f40ca5cb11..10c182067f9 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -1,7 +1,9 @@
 		What has changed in GDB?
 	     (Organized release by release)
 
-*** Changes since GDB 17
+*** Changes since GDB 18
+
+*** Changes in GDB 18
 
 * Support for the Common Trace Format (CTF) has been removed.  GDB now
   saves trace information exclusively in its own "tfile" format.
-- 
2.25.4