Issy Long c0642e1b84
vale-styles: Upgrade all checks to "error" level
- I added these all the way back in December 2019 in #6826, but only
  today realised that things have been failing unnoticeably because
  "warning" level exits with status code 0, so doesn't fail CI.
- Upgrading to "error" level will enable us to see the style errors in
  our docs and fix them faster.
- My editor also auto-formatted the YAML to have double quotes instead
  of single.
2020-10-21 21:10:50 +01:00
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