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/sms/index.ts

@@ -73,7 +73,7 @@ export class SMS extends IonicNativePlugin {
     phoneNumber: string | string[],
     message: string,
     options?: SmsOptions
-  ): Promise<any> { return; }
+    ): Promise<any> { return; }
 
   /**
    * This function lets you know if the app has permission to send SMS