fix dupe heading

Author: TylerMSFT

docs/standard-library/year-month-weekday-last-class.md

@@ -73,7 +73,7 @@ The [`weekday_last`](weekdaylast-class.md) value.
 *`y`*\
 The [`year`](year-class.md) value.
 
-## Remarks
+## Remarks: constructor
 
 For information about C++ 20 syntax used to specify dates, see [`operator/`](chrono-operators.md#op_/)