Add note to CredentialPicker API about non-UWP app restriction (#2472)

* Update CredentialPicker::PickAsync(options) for Caption requirement

* Update more members

* Update credentialpicker_pickasync_1330776073.md

* Update credentialpicker_pickasync_1621420115.md

* Update credentialpicker_pickasync_693496969.md

---------

Co-authored-by: Steven White <31261191+stevewhims@users.noreply.github.com>

Author: MikeHillberg

windows.security.credentials.ui/credentialpicker_pickasync_1330776073.md

@@ -13,6 +13,7 @@ public Windows.Foundation.IAsyncOperation<Windows.Security.Credentials.UI.Creden
 Constructor used to initiate asynchronous prompting operations using three inputs.
 
 ## -parameters
+
 ### -param targetName
 The target name to display.
 
@@ -22,6 +23,9 @@ The message to display in the dialog box.
 ### -param caption
 The caption to display in the dialog box.
 
+> [!NOTE]
+> This value must be set for a non-UWP (that is, desktop) app.
+
 ## -returns
 The credential and options from the user.
 
@@ -30,4 +34,4 @@ The credential and options from the user.
 ## -examples
 
 ## -see-also
-[PickAsync(CredentialPickerOptions)](credentialpicker_pickasync_1621420115.md), [PickAsync(String, String)](credentialpicker_pickasync_693496969.md)
+[PickAsync(CredentialPickerOptions)](credentialpicker_pickasync_1621420115.md), [PickAsync(String, String)](credentialpicker_pickasync_693496969.md)

windows.security.credentials.ui/credentialpicker_pickasync_1621420115.md

@@ -16,6 +16,9 @@ Displays a dialog box to the user and collects credentials from the user.
 ### -param options
 The options on displaying and collecting the credential box.
 
+> [!NOTE]
+> In a non-UWP (that is, desktop) app, the [CredentialPickerOptions.Caption](/uwp/api/Windows.Security.Credentials.UI.CredentialPickerOptions.Caption) must be set.
+
 ## -returns
 The credential and options from the user.
 
@@ -24,4 +27,4 @@ The credential and options from the user.
 ## -examples
 
 ## -see-also
-[PickAsync(String, String)](credentialpicker_pickasync_693496969.md), [PickAsync(String, String, String)](credentialpicker_pickasync_1330776073.md)
+[PickAsync(String, String)](credentialpicker_pickasync_693496969.md), [PickAsync(String, String, String)](credentialpicker_pickasync_1330776073.md)

windows.security.credentials.ui/credentialpicker_pickasync_693496969.md

@@ -24,7 +24,9 @@ The credential and options from the user.
 
 ## -remarks
 
+This method is supported only in UWP apps. In a non-UWP (that is, desktop) app, use the three-parameter overload, and set the *caption* parameter.
+
 ## -examples
 
 ## -see-also
-[PickAsync(CredentialPickerOptions)](credentialpicker_pickasync_1621420115.md), [PickAsync(String, String, String)](credentialpicker_pickasync_1330776073.md)
+[PickAsync(CredentialPickerOptions)](credentialpicker_pickasync_1621420115.md), [PickAsync(String, String, String)](credentialpicker_pickasync_1330776073.md)