Add pre-commit hook option to buildifier instructions (#1163)
Add pre-commit hook option to buildifier instructions (#1163)

Ideally we should add a config option for repos to set a custom message in their .bazelci but I'm not sure if maintainers want that complexity added.
Fixes #1161
bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration