docs: add config example

docs/Options.md

@@ -1,13 +1,19 @@
 electron-builder [configuration](#Config) can be defined 
-* in the `package.json` file of your project using the `build` key on the top level
+* in the `package.json` file of your project using the `build` key on the top level:
+   ```json
+   "build": {
+     "appId": "com.example.app"
+   }
+   ```
 * or through the `--config <path/to/yml-or-json5>` option (defaults to `electron-builder.yml` (or `json`, or [json5](http://json5.org))).
+   ```yaml
+   appId: "com.example.app"
+   ```
 
 See [Config](#Config).
 
 Most of the options accept `null` — for example, to explicitly set that DMG icon must be default volume icon from the OS and default rules must be not applied (i.e. use application icon as DMG icon), set `dmg.icon` to `null`.
 
-Most of the options supports inheritance — `f`
-
 ## File Patterns
 
 Hidden files are not ignored by default, but all files that should be ignored, are [ignored by default](#default-file-pattern).

packages/electron-builder/src/metadata.ts

@@ -161,7 +161,7 @@ export interface Config extends PlatformSpecificBuildOptions {
   readonly electronDownload?: any
 
   /**
-   * Array of option objects. Order is important — first item will be used as a default auto-update server on Windows (NSIS).
+   * Array of option objects. Order is important — first item will be used as a default auto-update server.
    * @see [Publish options](https://github.com/electron-userland/electron-builder/wiki/Publishing-Artifacts#publish-options).
    */
   readonly publish?: Publish