update @obj syntax lookup documentation

Author: tsnobip

misc_docs/syntax/decorator_obj.mdx

@@ -6,6 +6,9 @@ summary: "This is the `@obj` decorator."
 category: "decorators"
 ---
 
+
+> Deprecated since compiler version 11.0. It was mainly used to bind to JS param objects with many optional fields, [records with optional fields](https://rescript-lang.org/docs/manual/latest/record#optional-record-fields) are now natively supported.
+
 The `@obj` decorator is used to create functions that return JavaScript objects
 with properties that match the function's parameter labels.
 
@@ -30,4 +33,4 @@ var helloAction = {
 
 ### References
 
-* [Convert External into JS Object Creation Function](/docs/manual/latest/generate-converters-accessors#convert-external-into-js-object-creation-function)
+* [Convert External into JS Object Creation Function](/docs/manual/v10.0.0/generate-converters-accessors#convert-external-into-js-object-creation-function)