Update triage-guide.md

Author: bdougie

docs/contributing/triage-guide.md

@@ -21,6 +21,7 @@ When a new issue or pull request is opened the issue will be labeled with `needs
 - `discuss`: Topics for discussion. Might end in an `enhancement` or `question` label.
 - `bug`: Issues that present a reasonable conviction there is a reproducible bug.
 - `enhancement`: Issues that are found to be a reasonable candidate feature additions.
+- `style`: small css or visual changes.
 
 In all cases, issues may be closed by maintainers if they don't receive a timely response when further information is sought, or when additional questions are asked.