Update documentation

ballerina/json_api.bal

@@ -61,7 +61,8 @@ public isolated function toJson(anydata v)
 
 # Represent the options that can be used to modify the behaviour of the projection.
 #
-# + allowDataProjection - enable or disable projection
+# + nilAsOptionalField - If true, nil values will be treated as optional fields in the projection.
+# + absentAsNilableType - If true, absent fields will be treated as nilable types in the projection.
 public type Options record {
     boolean nilAsOptionalField = false;
     boolean absentAsNilableType = false;