Update merge-and-release.yml

This commit improves the message set as part of the release notes.

Signed-off-by: Rafael Sene <[email protected]>

.github/workflows/merge-and-release.yml

@@ -79,7 +79,7 @@ jobs:
         generate_release_notes: true
         body: |
               This release was created by: ${{ github.event.sender.login }}
-              RISC-V ISA released generated based on commit ${{ env.SHORT_SHA }}
+              Release of RISC-V ISA, built from commit ${{ env.SHORT_SHA }}, is now available.
         files: |
           ${{ github.workspace }}/build/priv-isa-asciidoc.pdf
           ${{ github.workspace }}/build/priv-isa-asciidoc.html