docs: update description of ESlint default linted files (#6199)

Author: Robin-Hoodie

docs/core-plugins/eslint.md

@@ -17,9 +17,14 @@
     --max-warnings       specify number of warnings to make build failed (default: Infinity)
   ```
 
-  Lints and fixes files. If no specific files are given, it lints all files in `src` and `tests`.
+Lints and fixes files. If no specific files are given, it lints all files in `src` and `tests`, as well as all JavaScript files in the root directory (these are most often config files such as `babel.config.js` or `.eslintrc.js`).
+
+Other [ESLint CLI options](https://eslint.org/docs/user-guide/command-line-interface#options) are also supported.
+  
+::: tip
+`vue-cli-service lint` will lint dotfiles `.*.js` by default. If you want to follow ESLint's default behavior instead, consider adding a `.eslintignore` file in your project.
+:::
 
-  Other [ESLint CLI options](https://eslint.org/docs/user-guide/command-line-interface#options) are also supported.
 
 ## Configuration