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/youtube-video-player/index.ts

@@ -6,7 +6,7 @@ import { Plugin, Cordova, IonicNativePlugin } from '@ionic-native/core';
  * Plays YouTube videos in Native YouTube App
  *
  * @usage
- * ```
+ * ```typescript
  * import { YoutubeVideoPlayer } from '@ionic-native/youtube-video-player';
  *
  * constructor(private youtube: YoutubeVideoPlayer) { }
@@ -31,6 +31,6 @@ export class YoutubeVideoPlayer extends IonicNativePlugin {
    * Plays a YouTube video
    * @param videoId {string} Video ID
    */
-  @Cordova({sync: true})
+  @Cordova({ sync: true })
   openVideo(videoId: string): void { }
 }