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/alipay/index.ts

@@ -67,7 +67,7 @@ export interface AlipayOrder {
  * Requires Cordova plugin: `cordova-alipay-base`. For more info, please see the [Alipay plugin docs](https://github.com/xueron/cordova-alipay-base).
  *
  * @usage
- * ```
+ * ```typescript
  * import { Alipay, AlipayOrder } from '@ionic-native/alipay';
  *
  * constructor(private alipay: Alipay) {
@@ -112,4 +112,3 @@ export class Alipay extends IonicNativePlugin {
   @Cordova()
   pay(order: AlipayOrder): Promise<any> { return; }
 }
-