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

@@ -24,7 +24,7 @@
 |`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|