message: Use proper capitalisation for Buildkite
diff: @@ -38,7 +38,7 @@ else
  head=$BUILDKITE_BRANCH
  fi
  -# If head is set, it will contain on BuildKite either:
  +# If head is set, it will contain on Buildkite either:
  # * "branch" when the author's branch and target branch are in the same repo
  # * "fork:branch" when the author's branch is in their fork or if this is a Netlify build
  # We can split on `:` into an array to check.
  