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/nfc/index.ts

@@ -16,7 +16,7 @@ declare let window: any;
  * This plugin uses NDEF (NFC Data Exchange Format) for maximum compatibilty between NFC devices, tag types, and operating systems.
  *
  * @usage
- * ```
+ * ```typescript
  * import { NFC, Ndef } from '@ionic-native/nfc';
  *
  * constructor(private nfc: NFC, private ndef: Ndef) { }
@@ -34,9 +34,9 @@ declare let window: any;
   pluginRef: 'nfc',
   repo: 'https://github.com/chariotsolutions/phonegap-nfc'
 })
-  /**
-  *@{ NFC } class methods
-  */
+/**
+*@{ NFC } class methods
+*/
 @Injectable()
 export class NFC extends IonicNativePlugin {
   /**
@@ -52,7 +52,7 @@ export class NFC extends IonicNativePlugin {
     clearFunction: 'removeNdefListener',
     clearWithArgs: true
   })
-  addNdefListener(onSuccess?: Function, onFailure?: Function): Observable<any> {return; }
+  addNdefListener(onSuccess?: Function, onFailure?: Function): Observable<any> { return; }
 
   /**
    * Registers an event listener for tags matching any tag type.
@@ -67,7 +67,7 @@ export class NFC extends IonicNativePlugin {
     clearFunction: 'removeTagDiscoveredListener',
     clearWithArgs: true
   })
-  addTagDiscoveredListener(onSuccess?: Function, onFailure?: Function): Observable<any> {return; }
+  addTagDiscoveredListener(onSuccess?: Function, onFailure?: Function): Observable<any> { return; }
 
   /**
    * Registers an event listener for NDEF tags matching a specified MIME type.
@@ -83,7 +83,7 @@ export class NFC extends IonicNativePlugin {
     clearFunction: 'removeMimeTypeListener',
     clearWithArgs: true
   })
-  addMimeTypeListener(mimeType: string, onSuccess?: Function, onFailure?: Function): Observable<any> {return; }
+  addMimeTypeListener(mimeType: string, onSuccess?: Function, onFailure?: Function): Observable<any> { return; }
 
   /**
    * Registers an event listener for formatable NDEF tags.
@@ -96,7 +96,7 @@ export class NFC extends IonicNativePlugin {
     successIndex: 0,
     errorIndex: 3
   })
-  addNdefFormatableListener(onSuccess?: Function, onFailure?: Function): Observable<any> {return; }
+  addNdefFormatableListener(onSuccess?: Function, onFailure?: Function): Observable<any> { return; }
 
   /**
    * Writes an NdefMessage(array of ndef records) to a NFC tag.
@@ -104,13 +104,13 @@ export class NFC extends IonicNativePlugin {
    * @returns {Promise<any>}
    */
   @Cordova()
-  write(message: any[]): Promise<any> {return; }
+  write(message: any[]): Promise<any> { return; }
   /**
    * Makes a NFC tag read only. **Warning** this is permanent.
    * @returns {Promise<any>}
    */
   @Cordova()
-  makeReadyOnly(): Promise<any> {return; }
+  makeReadyOnly(): Promise<any> { return; }
 
   /**
    * Shares an NDEF Message(array of ndef records) via peer-to-peer.
@@ -118,20 +118,20 @@ export class NFC extends IonicNativePlugin {
    * @returns {Promise<any>}
    */
   @Cordova()
-  share(message: any[]): Promise<any> {return; }
+  share(message: any[]): Promise<any> { return; }
 
   /**
    * Stop sharing NDEF data via peer-to-peer.
    * @returns {Promise<any>}
    */
   @Cordova()
-  unshare(): Promise<any> {return; }
+  unshare(): Promise<any> { return; }
 
   /**
    * Erase a NDEF tag
    */
   @Cordova()
-  erase(): Promise<any> {return; }
+  erase(): Promise<any> { return; }
 
   /**
    * Send a file to another device via NFC handover.
@@ -139,28 +139,28 @@ export class NFC extends IonicNativePlugin {
    * @returns {Promise<any>}
    */
   @Cordova()
-  handover(uris: string[]): Promise<any> {return; }
+  handover(uris: string[]): Promise<any> { return; }
 
   /**
    * Stop sharing NDEF data via NFC handover.
    * @returns {Promise<any>}
    */
   @Cordova()
-  stopHandover(): Promise<any> {return; }
+  stopHandover(): Promise<any> { return; }
 
   /**
    * Opens the device's NFC settings.
    * @returns {Promise<any>}
    */
   @Cordova()
-  showSettings(): Promise<any> {return; }
+  showSettings(): Promise<any> { return; }
 
   /**
    * Check if NFC is available and enabled on this device.
    * @returns {Promise<any>}
    */
   @Cordova()
-  enabled(): Promise<any> {return; }
+  enabled(): Promise<any> { return; }
   /**
   * @{ NFC } class utility methods
   * for use with
@@ -171,14 +171,14 @@ export class NFC extends IonicNativePlugin {
    * @returns {string}
    */
   @Cordova({ sync: true })
-  bytesToString(bytes: number[]): string {return; }
+  bytesToString(bytes: number[]): string { return; }
   /**
    * Convert string to byte array.
    * @param str {string}
    * @returns {number[]}
    */
   @Cordova({ sync: true })
-  stringToBytes(str: string): number[] {return; };
+  stringToBytes(str: string): number[] { return; };
   /**
    * Convert byte array to hex string
    *
@@ -186,7 +186,7 @@ export class NFC extends IonicNativePlugin {
    * @returns {string}
    */
   @Cordova({ sync: true })
-  bytesToHexString(bytes: number[]): string {return; };
+  bytesToHexString(bytes: number[]): string { return; };
 
 }
 /**