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/secure-storage/index.ts

@@ -8,7 +8,7 @@ declare var cordova: any;
  */
 export class SecureStorageObject {
 
-  constructor(private _objectInstance?: any) {}
+  constructor(private _objectInstance?: any) { }
 
   /**
    * Gets a stored item