Docs: Typescript Configuration for v5

Updating Typescript example code to reflect Webpack "full control" mode in Storybook v5.

docs/src/pages/configurations/typescript-config/index.md

@@ -25,21 +25,25 @@ We first have to use the [custom Webpack config in full control mode, extending
 
 ```js
 const path = require('path');
-module.exports = (baseConfig, env, config) => {
+module.exports = ({ config, mode }) => {
   config.module.rules.push({
     test: /\.(ts|tsx)$/,
-    use: [{
+    use: [
-      loader: require.resolve('awesome-typescript-loader')
+      {
-    }, {
+        loader: require.resolve('awesome-typescript-loader')
-      loader: require.resolve('react-docgen-typescript-loader')
+      },
-    }]
+      // Optional
+      {
+        loader: require.resolve('react-docgen-typescript-loader')
+      }
+    ]
   });
   config.resolve.extensions.push('.ts', '.tsx');
   return config;
 };
 ```
 
-The above example shows a working Webpack config with the TSDocgen plugin also integrated; remove the optional sections if you don't plan on using them.
+The above example shows a working Webpack config with the [TSDocgen plugin](https://github.com/strothj/react-docgen-typescript-loader) integrated.  This plugin is not necessary to use Storybook and the section marked `// optional` can be safely removed if the features of TSDocgen are not required.
 
 ### `tsconfig.json`
 
@@ -91,13 +95,13 @@ yarn add -D @types/storybook__react # typings
 We first have to use the [custom Webpack config in full control mode, extending default configs](/configurations/custom-webpack-config/#full-control-mode--default) by creating a `webpack.config.js` file in our Storybook configuration directory (by default, it’s `.storybook`):
 
 ```js
-module.exports = (baseConfig, env, config) => {
+module.exports = ({ config, mode }) => {
   config.module.rules.push({
     test: /\.(ts|tsx)$/,
     loader: require.resolve('babel-loader'),
     options: {
-      presets: [['react-app', { flow: false, typescript: true }]],
+      presets: [['react-app', { flow: false, typescript: true }]]
-    },
+    }
   });
   config.resolve.extensions.push('.ts', '.tsx');
   return config;