Add documentation for TARGET_ELECTRON

docusaurus/docs/advanced-configuration.md

@@ -22,3 +22,4 @@ You can adjust various development and production settings by setting environmen
 | NODE_PATH               |   ✅ Used   |  ✅ Used   | Same as [`NODE_PATH` in Node.js](https://nodejs.org/api/modules.html#modules_loading_from_the_global_folders), but only relative folders are allowed. Can be handy for emulating a monorepo setup by setting `NODE_PATH=src`.                                                                                                                                                                                                                                                                                                                                                                                                                                            |
 | INLINE_RUNTIME_CHUNK    | 🚫 Ignored  |  ✅ Used   | By default, Create React App will embed the runtime script into `index.html` during the production build. When set to `false`, the script will not be embedded and will be imported as usual. This is normally required when dealing with CSP.                                                                                                                                                                                                                                                                                                                                                                                                                           |
 | IMAGE_INLINE_SIZE_LIMIT | 🚫 Ignored  |  ✅ Used   | By default, images smaller than 10,000 bytes are encoded as a data URI in base64 and inlined in the CSS or JS build artifact. Set this to control the size limit in bytes. Setting it to 0 will disable the inlining of images.                                                                                                                                                                                                                                                                                                                                                                                                                                          |
+| TARGET_ELECTRON         |   ✅ Used   |  ✅ Used   | When set to `true`, the internal webpack [target](https://webpack.js.org/configuration/target/) is set to `electron-renderer` and native Node modules are no longer mocked. This makes using Create React App with electron possible.                                                                                                                                                                                                                                                                                                                                                                                                                                    |