Update two autodevops template references to default branch

changelogs/unreleased/update-ci-template-default-branch-3.yml

+---
+title: Update templates to refer to default branch
+merge_request: 56304
+author:
+type: other

lib/gitlab/ci/templates/Jobs/Deploy.gitlab-ci.yml

@@ -153,7 +153,7 @@ production_manual:
     - if: '$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH && $CANARY_ENABLED'
       when: manual
 
-# This job implements incremental rollout on for every push to `master`.
+# This job implements incremental rollout on for every push to the default branch.
 
 .rollout: &rollout_template
   extends: .auto-deploy

lib/gitlab/ci/templates/Jobs/Deploy.latest.gitlab-ci.yml

@@ -152,7 +152,7 @@ production_manual:
     - if: '$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH && $CANARY_ENABLED'
       when: manual
 
-# This job implements incremental rollout on for every push to `master`.
+# This job implements incremental rollout on for every push to the default branch.
 
 .rollout: &rollout_template
   extends: .auto-deploy