Fix formatting of release notes (#18533)

PiperOrigin-RevId: 536324450
Change-Id: I62c0aa7c91f5b38ddae9fae0127ea7b3fb601862
diff --git a/scripts/release/relnotes.py b/scripts/release/relnotes.py
index 402475a..fcdfb86 100644
--- a/scripts/release/relnotes.py
+++ b/scripts/release/relnotes.py
@@ -209,11 +209,13 @@
         print("+", note)
       print()
   else:
+    print()
     for note in filtered_relnotes:
       print("+", note)
 
   print()
   print("Acknowledgements:")
   external_authors = get_external_authors_between(merge_base, "HEAD")
+  print()
   print("This release contains contributions from many people at Google" +
         ("." if not external_authors else f", as well as {external_authors}."))