Warning about UseAuthorisation appearing in 3.1

[centreboard]

Describe the bug

Warning about .UseAuthorisation() when chaining builder pattern calls in 3.1 preview 1 instead of calling on separate lines.
This appears to be the message from #14401

To Reproduce

Steps to reproduce the behaviour:

1. Using this version of ASP.NET Core '3.1.100-preview1-014459'
2. Run this code

• 'dotnet new webapp'
• change

app.UseRouting();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
    endpoints.MapRazorPages();
});

• to

app.UseRouting()
   .UseAuthorization()
   .UseEndpoints(endpoints =>
   {
       endpoints.MapRazorPages();
   });

3. Run dotnet build
4. See Startup.cs(46,13): warning ASP0001: The call to UseAuthorization should appear between app.UseRouting() and app.UseEndpoints(..) for authorization to be correctly evaluated.

Expected behaviour

No warnings

Additional context

Add any other context about the problem here.
Include the output of dotnet --info

.NET Core SDK (reflecting any global.json):
Version: 3.1.100-preview1-014459
Commit: ac3b59712d

Runtime Environment:
OS Name: Windows
OS Version: 10.0.17763
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\3.1.100-preview1-014459\

Host (useful for support):
Version: 3.1.0-preview1.19506.1
Commit: bbf5542781

[centreboard]

This appears to be an issue in
https://github.com/aspnet/AspNetCore/blob/0c5e370b7c2352bed7ac862b1ef5c6186362a512/src/Analyzers/Analyzers/src/MiddlewareAnalyzer.cs#L25

The source-order that comes back from app.UseRouting(); app.UseAuthorization(); is

• UseRouting
• UseAuthorization

While from the chained version app.UseRouting().UseAuthorization(); it's

• UseAuthorization
• UseRouting

[mkArtakMSFT]

Thanks for bringing this up, @centreboard.
@pranavkm can you please handle the PR review? Thanks!