Merge pull request #3890 from Tuppu/patch-16

Update part10d.md

Author: mluukkai

src/content/10/en/part10d.md

@@ -43,7 +43,7 @@ To use the jest-expo preset in Jest, we need to add the following Jest configura
 
 The <em>transform</em> option tells Jest to transform <i>.js</i> and <i>.jsx</i> files with the [Babel](https://babeljs.io/) compiler. The <em>transformIgnorePatterns</em> option is for ignoring certain directories in the <i>node_modules</i> directory while transforming files. This Jest configuration is almost identical to the one proposed in the Expo's [documentation](https://docs.expo.dev/develop/unit-testing/).
 
-To use the eslint-plugin-jest plugin in ESLint, we need to include it in the plugins and extensions array in the <i>.eslintrc</i> file:
+To use the eslint-plugin-jest plugin in ESLint, we need to include it in the plugins and extensions array in the <i>.eslintrc.json</i> file:
 
 ```javascript
 {