In general match the pre-existing style.
- Indent lines with spaces not tabs.
- Trim trailing whitespace.
The specifics are defined in the project's EditorConfig file and can be automatically configured for your editor with the appropriate plugin.
The feature format is
"Use `other_feature' instead (Month YYYY). [Optional further explanation.]"`
and for classes use
"Use OTHER_CLASS instead (Month YYYY). [Optional further explanation.]"
Output is consistently wrapped at 78 characters.