Merge pull request #2496 from citelao/patch-6

[DateTimeFormatter] Document basis for params for DateTimeFormatter

Author: Karl-Bridge-Microsoft

windows.globalization.datetimeformatting/datetimeformatter_datetimeformatter_1042679024.md

@@ -25,15 +25,15 @@ The list of language identifiers, in priority order, that represent the choice o
 
 ### -param geographicRegion
 
-The identifier for the geographic region. This identifier is used for resolving the template to a pattern.
+The identifier for a [GeographicRegion](windows.globalization.geographicregion.md) used to resolve the template to a pattern. This should be an ISO 3166-1 two-letter or three-letter code that identifies the country, or one of the three-digit UN-M49 codes that identify the geographical region.
 
 ### -param calendar
 
-The calendar identifier to use.
+The calendar identifier to use. This should be a value from [CalendarIdentifiers](windows.globalization.calendaridentifiers.md).
 
 ### -param clock
 
-The clock identifier to use.
+The clock identifier to use. This should be a value from [ClockIdentifiers](windows.globalization.clockidentifiers.md).
 
 ## -remarks