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/health/index.ts

@@ -160,7 +160,7 @@ export interface HealthData {
  * A plugin that abstracts fitness and health repositories like Apple HealthKit or Google Fit.
  *
  * @usage
- * ```
+ * ```typescript
  * import { Health } from '@ionic-native/health';
  *
  *