[@nativescript/geolocation] update Utils.Accuracy to CoreTypes.Accuracy (#23)

Author: vallemar

plugins/geolocation.md

@@ -24,8 +24,8 @@ In short here are the steps:
 
 ```typescript
 import * as geolocation from '@nativescript/geolocation'
-import { Utils } from '@nativescript/core'
-Utils.Accuracy // used to describe at what accuracy the ___location should be get
+import { CoreTypes } from '@nativescript/core'
+CoreTypes.Accuracy // used to describe at what accuracy the ___location should be get
 ```
 
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