Added since annotation to Filters.kt

JAVA-5308

Author: rozza

driver-kotlin-extensions/src/main/kotlin/com/mongodb/kotlin/client/model/Filters.kt

@@ -30,7 +30,11 @@ import kotlin.reflect.KProperty
 import org.bson.BsonType
 import org.bson.conversions.Bson
 
-/** Filters extension methods to improve Kotlin interop */
+/**
+ * Filters extension methods to improve Kotlin interop
+ *
+ * @since 5.3
+ */
 public object Filters {
 
     /**