[Dialog] Update docs

examples/Demo/Shared/Pages/Dialog/DialogPage.razor

@@ -25,6 +25,9 @@
     <code>&lt;FluentDialog&gt;</code> wraps the <code>&lt;fluent-dialog&gt;</code> element, a web component implementation of a dialog leveraging
     the Fluent UI design system. <code>&lt;FluentDialog&gt;</code> acts as a shell for the dialog content, which can be specified in a number of ways.
 </p>
+<p>
+    Note: Dialogs are always displayed centered. The left/right positioning only works for Panels.
+</p>
 <h2>DialogService</h2>
 <p>
     The <code>DialogService</code> is a service which is used to show different types of dialogs. It is registered as a scoped service, so it can be injected into

src/Core/Components/Dialog/Parameters/DialogParameters.cs

@@ -17,6 +17,7 @@ public class DialogParameters : ComponentParameters, IDialogParameters
     /// left (full height), right (full height)
     /// or screen middle (using Width and Height properties).
     /// HorizontalAlignment.Stretch is not supported for this property.
+    /// NOTE: Left/Right only works for Panels, not Dialogs, which are always centered.
     /// </summary>
     public virtual HorizontalAlignment Alignment
     {