fix: update legacy entry point

Author: brettz9

CONTRIBUTING.md

@@ -21,7 +21,7 @@ pnpm link ../eslint-plugin-jsdoc
 ## Building the project
 
 After running `pnpm install` to get the latest dependencies and devDependencies,
-you can run the following command to update the `dist` files, with `dist/index.js`
+you can run the following command to update the `dist` files, with `dist/index.cjs`
 being the `main` entry point from `package.json`:
 
 ```shell

package.json

@@ -84,7 +84,7 @@
     "*.js": "npm run lint-arg -- --fix"
   },
   "type": "module",
-  "main": "./dist/index.js",
+  "main": "./dist/index.cjs",
   "types": "./dist/index.d.ts",
   "exports": {
     "types": "./dist/index.d.ts",