doc: add not-an-aardvark as ESLint contact

Add not-an-aardvark as someone to CC for ESLint issues.

PR-URL: #11169
Reviewed-By: Teddy Katz <teddy.katz@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: Trott

doc/onboarding-extras.md

@@ -21,7 +21,7 @@
 | `src/async-wrap.*` | @trevnorris |
 | `src/node_crypto.*` | @nodejs/crypto |
 | `test/*` | @nodejs/testing |
-| `tools/eslint`, `.eslintrc` | @silverwind, @trott |
+| `tools/eslint`, `.eslintrc` | @not-an-aardvark, @silverwind, @trott |
 | async_hooks | @nodejs/diagnostics |
 | upgrading V8 | @nodejs/v8, @nodejs/post-mortem |
 | upgrading npm | @fishrock123, @MylesBorins |