fix dupe headings

Author: TylerMSFT

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

@@ -61,7 +61,7 @@ Construct a `month_weekday` with a month value of *`m`*.
 *`wdi`*\
 Construct a `month_weekday` with a weekday value of *`wdi`*.
 
-## Remarks
+## Remarks: Constructor
 
 For information about C++ 20 syntax to specify dates, see [`operator/`](chrono-operators.md#op_/)
 

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

@@ -60,7 +60,7 @@ The `month` value for the created `month_weekday_last` class.
 *`wdl`*\
 The` weekday_last` value for the created `month_weekday_last` class.
 
-## Remarks
+## Remarks: Constructor
 
 For information about C++ 20 syntax to specify dates, see [`operator/`](chrono-operators.md#op_/)
 

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

@@ -87,7 +87,7 @@ The [`weekday`](weekday-class.md) value.
 *`y`*\
 The [`year`] value.
 
-### Remarks
+### Remarks: Constructor
 
 1\) The default constructor doesn't initialize any of the fields.