remove dead comment

Signed-off-by: George Jenkins <gjenkins8@bloomberg.net>

.github/workflows/release.yml

@@ -8,7 +8,6 @@ on:
       - main
 
 # Note the only differences between release and canary-release jobs are:
-# - only canary passes --overwrite flag
 # - the VERSION make variable passed to 'make dist checksum' is expected to
 #   be "canary" if the job is triggered by a push to "main" branch. If the
 #   job is triggered by a tag push, VERSION should be the tag ref.