Migration topic Blazor nit updates (#20635)

aspnetcore/migration/31-to-50.md

@@ -68,7 +68,7 @@ If updating a Blazor WebAssembly project, skip to the [Update Blazor WebAssembly
     +<link href="{ASSEMBLY NAME}.styles.css" rel="stylesheet" />
     ```
     
-    Standalone Blazor WebAssembly example:
+    Standalone Blazor WebAssembly or Blazor Server example:
     
     ```diff
     +<link href="BlazorSample.styles.css" rel="stylesheet" />
@@ -80,7 +80,7 @@ If updating a Blazor WebAssembly project, skip to the [Update Blazor WebAssembly
     +<link href="BlazorSample.Client.styles.css" rel="stylesheet" />
     ```
 
-1. In the `Shared/MainLayout.razor` file, surround all of the content in a `<div>` element with an `class` of `page`:
+1. In the `MainLayout` component (`Shared/MainLayout.razor`), surround the component's HTML markup with a `<div>` element that has a `class` attribute set to `page`:
 
     ```razor
     <div class="page">
@@ -333,7 +333,7 @@ For a Blazor WebAssembly project, including the *`Client`* project of a hosted B
     +<app id="app">Loading...</app>
     ```
     
-1. In `Program.Main`:
+1. In `Program.Main` (`Program.cs`):
 
    * Change the reference to the `<app>` element to a CSS selector by adding a hash `#` to it.
    * Change the `HttpClient` registration to scoped.