tools/doc: add tools/remark-* to eslintignore

PR-URL: #17240
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

.eslintignore

@@ -4,6 +4,7 @@ test/addons/??_*
 test/fixtures
 tools/eslint
 tools/icu
+tools/remark-*
 node_modules
 benchmark/tmp
 doc/**/*.js