Rename Contains extension to ContainsId

src/Discord.Net/Extensions/CollectionExtensions.cs

@@ -15,7 +15,7 @@ namespace Discord
         public static IReadOnlyCollection<TValue> ToReadOnlyCollection<TValue>(this IEnumerable<TValue> query, Func<int> countFunc)
             => new ConcurrentDictionaryWrapper<TValue>(query, countFunc);
 
-        public static bool Contains(this IEnumerable<IEntity<ulong>> roles, ulong id)
+        public static bool ContainsId(this IEnumerable<IEntity<ulong>> roles, ulong id)
         {
             return roles.Any(x => x.Id == id);
         }