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/unique-device-id/index.ts

@@ -7,7 +7,7 @@ import { Injectable } from '@angular/core';
  * This plugin produces a unique, cross-install, app-specific device id.
  *
  * @usage
- * ```
+ * ```typescript
  * import { UniqueDeviceID } from '@ionic-native/unique-device-id';
  *
  * constructor(private uniqueDeviceID: UniqueDeviceID) { }