[vale] reported by reviewdog 🐶 [PingCAP.EmDash] Don't put a space before or after a dash. Raw Output: {"message": "[PingCAP.EmDash] Don't put a space before or after a dash.", "location": {"path": "system-variable-reference.md", "range": {"start": {"line": 991, "column": 38}}}, "severity": "ERROR"}