style(): unify docs and spacing (#1448)

* typo(barcode-scanner): fixe circle lint error

* typo(docs):  Unified the documentations

In some plugins the typescript markup was missing.
I also unified the console.log string from console.log("hello") to console.log('Hello') so any plugin page look the same.

src/@ionic-native/plugins/music-controls/index.ts

@@ -25,7 +25,7 @@ export interface MusicControlsOptions {
  * Handle also headset event (plug, unplug, headset button).
  *
  * @usage
- * ```
+ * ```typescript
  * import { MusicControls } from '@ionic-native/music-controls';
  *
  * constructor(private musicControls: MusicControls) { }
@@ -115,14 +115,14 @@ export class MusicControls extends IonicNativePlugin {
    * @returns {Promise<any>}
    */
   @Cordova()
-  create(options: MusicControlsOptions): Promise<any> {return; }
+  create(options: MusicControlsOptions): Promise<any> { return; }
 
   /**
    * Destroy the media controller
    * @returns {Promise<any>}
    */
   @Cordova()
-  destroy(): Promise<any> {return; }
+  destroy(): Promise<any> { return; }
 
   /**
    * Subscribe to the events of the media controller
@@ -131,25 +131,25 @@ export class MusicControls extends IonicNativePlugin {
   @Cordova({
     observable: true
   })
-  subscribe(): Observable<any> {return; }
+  subscribe(): Observable<any> { return; }
 
   /**
    * Start listening for events, this enables the Observable from the subscribe method
    */
-  @Cordova({sync: true})
-  listen(): void {}
+  @Cordova({ sync: true })
+  listen(): void { }
 
   /**
    * Toggle play/pause:
    * @param isPlaying {boolean}
    */
   @Cordova()
-  updateIsPlaying(isPlaying: boolean): void {}
+  updateIsPlaying(isPlaying: boolean): void { }
 
   /**
    * Toggle dismissable:
    * @param dismissable {boolean}
    */
   @Cordova()
-  updateDismissable(dismissable: boolean): void {}
+  updateDismissable(dismissable: boolean): void { }
 }