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/power-management/index.ts

@@ -7,7 +7,7 @@ import { Plugin, Cordova, IonicNativePlugin } from '@ionic-native/core';
  * It should be used for applications which keep running for a long time without any user interaction.
  *
  * @usage
- * ```
+ * ```typescript
  * import { PowerManagement } from '@ionic-native/power-management';
  *
  * constructor(private powerManagement: PowerManagement) { }
@@ -33,21 +33,21 @@ export class PowerManagement extends IonicNativePlugin {
    * @returns {Promise<any>}
    */
   @Cordova()
-  acquire(): Promise<any> {return; }
+  acquire(): Promise<any> { return; }
 
   /**
    * This acquires a partial wakelock, allowing the screen to be dimmed.
    * @returns {Promise<any>}
    */
   @Cordova()
-  dim(): Promise<any> {return; }
+  dim(): Promise<any> { return; }
 
   /**
    * Release the wakelock. It's important to do this when you're finished with the wakelock, to avoid unnecessary battery drain.
    * @returns {Promise<any>}
    */
   @Cordova()
-  release(): Promise<any> {return; }
+  release(): Promise<any> { return; }
 
   /**
    * By default, the plugin will automatically release a wakelock when your app is paused (e.g. when the screen is turned off, or the user switches to another app).
@@ -56,5 +56,5 @@ export class PowerManagement extends IonicNativePlugin {
    * @returns {Promise<any>}
    */
   @Cordova()
-  setReleaseOnPause(set: boolean): Promise<any> {return; }
+  setReleaseOnPause(set: boolean): Promise<any> { return; }
 }