Blazor code example enhancements (#20284)

Author: guardrex

aspnetcore/blazor/components/data-binding.md

@@ -227,11 +227,11 @@ Password:
     [Parameter]
     public EventCallback<string> PasswordChanged { get; set; }
 
-    private Task OnPasswordChanged(ChangeEventArgs e)
+    private async Task OnPasswordChanged(ChangeEventArgs e)
     {
         password = e.Value.ToString();
 
-        return PasswordChanged.InvokeAsync(password);
+        await PasswordChanged.InvokeAsync(password);
     }
 
     private void ToggleShowPassword()
@@ -287,7 +287,7 @@ Password:
     private Task OnPasswordChanged(ChangeEventArgs e)
     {
         password = e.Value.ToString();
-        
+
         if (password.Contains(' '))
         {
             validationMessage = "Spaces not allowed!";
@@ -373,9 +373,9 @@ The following components demonstrate the preceding concepts:
         set => PropertyChanged.InvokeAsync(value);
     }
 
-    private Task ChangeValue()
+    private async Task ChangeValue()
     {
-        return PropertyChanged.InvokeAsync($"Set in Child {DateTime.Now}");
+        await PropertyChanged.InvokeAsync($"Set in Child {DateTime.Now}");
     }
 }
 ```
@@ -400,9 +400,9 @@ The following components demonstrate the preceding concepts:
     [Parameter]
     public EventCallback<string> PropertyChanged { get; set; }
 
-    private Task ChangeValue()
+    private async Task ChangeValue()
     {
-        return PropertyChanged.InvokeAsync($"Set in Grandchild {DateTime.Now}");
+        await PropertyChanged.InvokeAsync($"Set in Grandchild {DateTime.Now}");
     }
 }
 ```

aspnetcore/blazor/components/event-handling.md

@@ -55,7 +55,7 @@ In the following example, `UpdateHeading` is called asynchronously when the butt
 @code {
     private async Task UpdateHeading(MouseEventArgs e)
     {
-        ...
+        await ...
     }
 }
 ```

aspnetcore/blazor/security/webassembly/hosted-with-identity-server.md

@@ -402,20 +402,20 @@ public class ProfileService : IProfileService
     {
     }
 
-    public Task GetProfileDataAsync(ProfileDataRequestContext context)
+    public async Task GetProfileDataAsync(ProfileDataRequestContext context)
     {
         var nameClaim = context.Subject.FindAll(JwtClaimTypes.Name);
         context.IssuedClaims.AddRange(nameClaim);
 
         var roleClaims = context.Subject.FindAll(JwtClaimTypes.Role);
         context.IssuedClaims.AddRange(roleClaims);
 
-        return Task.CompletedTask;
+        await Task.CompletedTask;
     }
 
-    public Task IsActiveAsync(IsActiveContext context)
+    public async Task IsActiveAsync(IsActiveContext context)
     {
-        return Task.CompletedTask;
+        await Task.CompletedTask;
     }
 }
 ```