docs(error): improve the cacheFactory/iid.ngdoc

Author: IgorMinar

docs/content/error/cacheFactory/iid.ngdoc

@@ -3,5 +3,6 @@
 @fullName Invalid ID
 @description
 
-This error occurs when trying to create a new `cacheFactory` object with a 
-specified cache ID, but the cache ID is already taken.
+This error occurs when trying to create a new `cache` object via {@link api/ng.$cacheFactory} with an ID that was already used to create another cache object.
+
+To resolve the error please use a different cache ID when calling `$cacheFactory`.