LibJS: Add missing spec link to YearMonthFromFields

Author: https://github.com/linusg
Commit: cbe7015c0c
Pull-request: https://github.com/SerenityOS/serenity/pull/9457
Reviewed-by: https://github.com/IdanHo ✅

Userland/Libraries/LibJS/Runtime/Temporal/Calendar.cpp

@@ -417,7 +417,7 @@ PlainDate* date_from_fields(GlobalObject& global_object, Object& calendar, Objec
     return static_cast<PlainDate*>(date_object);
 }
 
-// 12.1.25 YearMonthFromFields ( calendar, fields [ , options ] ),
+// 12.1.25 YearMonthFromFields ( calendar, fields [ , options ] ), https://tc39.es/proposal-temporal/#sec-temporal-yearmonthfromfields
 PlainYearMonth* year_month_from_fields(GlobalObject& global_object, Object& calendar, Object& fields, Object* options)
 {
     auto& vm = global_object.vm();