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/core/decorators.ts

@@ -127,10 +127,10 @@ export function InstanceCheck(opts: CordovaCheckOptions = {}) {
           if (opts.sync) {
             return;
           } else if (opts.observable) {
-            return new Observable<any>(() => {});
+            return new Observable<any>(() => { });
           }
 
-          return getPromise(() => {});
+          return getPromise(() => { });
 
         }
       }
@@ -290,10 +290,10 @@ export function CordovaProperty(target: any, key: string) {
 export function InstanceProperty(target: any, key: string) {
   Object.defineProperty(target, key, {
     enumerable: true,
-    get: function(){
+    get: function() {
       return this._objectInstance[key];
     },
-    set: function(value){
+    set: function(value) {
       this._objectInstance[key] = value;
     }
   });

src/@ionic-native/core/ionic-native-plugin.ts

@@ -21,7 +21,7 @@ export class IonicNativePlugin {
   /**
    * Returns the original plugin object
    */
-  static getPlugin(): any {}
+  static getPlugin(): any { }
 
   /**
    * Returns the plugin's name

src/@ionic-native/core/plugin.ts

@@ -150,7 +150,7 @@ function wrapPromise(pluginObj: any, methodName: string, args: any[], opts: any
   return p;
 }
 
-function wrapOtherPromise(pluginObj: any, methodName: string, args: any[], opts: any= {}) {
+function wrapOtherPromise(pluginObj: any, methodName: string, args: any[], opts: any = {}) {
   return getPromise((resolve, reject) => {
     const pluginResult = callCordovaPlugin(pluginObj, methodName, args, opts);
     if (pluginResult) {
@@ -225,7 +225,7 @@ export function overrideFunction(pluginObj: any, methodName: string, args: any[]
     if (availabilityCheck === true) {
       const pluginInstance = getPlugin(pluginObj.constructor.getPluginRef());
       pluginInstance[methodName] = observer.next.bind(observer);
-      return () => pluginInstance[methodName] = () => {};
+      return () => pluginInstance[methodName] = () => { };
     } else {
       observer.error(availabilityCheck);
       observer.complete();