Fix linter

package.json

@@ -113,7 +113,7 @@
     "build": "npm run build-docs # invoked by publisher when publishing docs on the mb-pages branch",
     "start-docs": "npm run build-min && npm run build-docs && jekyll serve --watch",
     "lint": "eslint --ignore-path .gitignore src test bench docs/_posts/examples/*.html debug/*.html",
-    "lint-docs": "documentation lint",
+    "lint-docs": "documentation lint src/index.js",
     "open-changed-examples": "git diff --name-only mb-pages HEAD -- docs/_posts/examples/*.html | awk '{print \"http://127.0.0.1:4000/mapbox-gl-js/example/\" substr($0,33,length($0)-37)}' | xargs open",
     "test": "run-s lint test-unit test-flow",
     "test-suite": "run-s test-render test-query",