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/flurry-analytics/index.ts

@@ -78,7 +78,7 @@ export interface FlurryAnalyticsLocation {
  * This plugin connects to Flurry Analytics SDK
  *
  * @usage
- * ```
+ * ```typescript
  * import { FlurryAnalytics } from 'ionic-native/flurry-analytics';
  *
  * constructor(private flurryAnalytics: FlurryAnalytics) { }