release: Added ^L ctrl character to denote end of this release's notes.

It seems that the release scripts use the presence of the ^L character
to determine the boundaries of the notes for each version.
This point has been forgotten in time. I add it back here, but also
have modified the sed script to properly chop up the NEWS file.

NEWS

@@ -73,6 +73,7 @@
 
 - Added translations for newly support language Turkish.
 
+
 ## New with 1.3.1 (released 2024-05-22)
 
 ### Backends

tools/create-release.sh

@@ -25,7 +25,7 @@ cat << EOF > release.json
 {
   "name": "SANE Backends $CI_COMMIT_TAG",
   "tag_name": "$CI_COMMIT_TAG",
-  "description": "$(sed '1,3d; //{s/.*//; q}' NEWS \
+  "description": "$(sed '1,3d; //,$d}' NEWS \
      | git stripspace \
      | sed 's/"/\\"/g; s/$/\\n/g' \
      | tr -d '\n')",