CI: docker: minor comment updates

.travis.yml

@@ -174,15 +174,16 @@ jobs:
     apt:
      packages:
    before_install: &docker_before_install
-   # for counting clones, excluding ours
    - |
+      # for counting clones, excluding ours
       if [[ -n "$GITHUB_API_TOKEN" ]]; then
         git clone https://$GITHUB_API_TOKEN@github.com/ccp-petmr-codebot/github-stats --branch $TRAVIS_REPO_SLUG
         # update with last fortnight's clones from GitHub API
         source github-stats/setup.sh
         # count unique clones, excluding travis, and print total
         gh_stats_count -k uniques
       fi
+      # login required early to increase pull rate limits
       if [[ "$TRAVIS_SECURE_ENV_VARS" == true ]]; then
         echo "$DOCKER_PWD" | docker login -u $DOCKER_USR --password-stdin
       fi