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/keyboard/index.ts

@@ -34,7 +34,7 @@ export class Keyboard extends IonicNativePlugin {
    * Hide the keyboard accessory bar with the next, previous and done buttons.
    * @param hide {boolean}
    */
-   @Cordova({sync: true})
+  @Cordova({ sync: true })
   hideKeyboardAccessoryBar(hide: boolean): void { }
 
   /**