Change navbar link to Movies controller - #37588

@manishm004, Thanks very much for offering to help here.

I think there is some confustion about the state the _Layout.cshtml has to represent at a particular point in the tutorial series. Over the course of steps it needs to represent one state and then later we have source that represents a later state after steps in the tutorial have been completed. The file you want to change in this PR represents an earlier state, not the completed state and needs to stay as is. (The PR should not change the file and the PR should be closed.)

The completed app example lives here in the sample/9.0-completed folder:
https://github.com/dotnet/AspNetCore.Docs/tree/main/aspnetcore/tutorials/first-mvc-app/start-mvc/sample/9.0-completed

Here is a table to lay that all out where we can see it. This tutorial series contains a lot of progressive states as each new subject is taught.

Why the navbar brand link is HelloWorld in Part 3 (and shouldn't be changed to Movies):

The Get started with ASP.NET Core MVC series (aspnetcore/tutorials/first-mvc-app/) is deliberately built as a progression: you start with a temporary "example A" state and are later shown how to change it to "example B." The navbar brand link's asp-controller value is one of those things that intentionally starts as one value and changes later. Here's the full arc:

The key point for this PR

• The brand link's value is a navigation target, not a displayed value. The label "Movie App" is a hard-coded string the whole time — it never becomes data-driven. Only the destination controller changes: HelloWorld (Part 3) → Movies (Part 4).
• So in Part 3, asp-controller="HelloWorld" is the correct, intentional temporary state. Changing it to Movies (as this PR suggests) skips ahead to a controller that doesn't exist yet and breaks the deliberate "start here, change it later" teaching device.

Two source-code collections (as expected in this series)

• Per-step "state" samples (start-mvc/sample/MvcMovie10, MvcMovie90, MvcMovie80, …): capture each intermediate state. For Part 3, these should use HelloWorld.
• Completed apps (start-mvc/sample/*-completed): the final state, which correctly uses Movies.