Light Freshness Edit: ASP.NET - mvc

[lootle1]

This PR contains freshness updates to the following articles:

• Overview of ASP.NET Core MVC
  [Answered by Wade in other now closed PR here pushed to this PR] Row 119, the link https://jqueryvalidation.org/ goes to a page with an invalid SSL and host error. Perhaps they're in the process of updating but curious if you want to remove, replace, or leave as is? I did search for a replacement in case we want to replace but didn't locate anything.
• Layout in ASP.NET Core
• Views in ASP.NET Core MVC
• Razor syntax reference for ASP.NET Core
• Partial views in ASP.NET Core

Minor grammar/style updates. Link updates.
For request details, see 568764

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Internal previews

📄 File	🔗 Preview link
aspnetcore/mvc/overview.md	Overview of ASP.NET Core MVC
aspnetcore/mvc/views/layout.md	Layout in ASP.NET Core
aspnetcore/mvc/views/overview.md	Views in ASP.NET Core MVC
aspnetcore/mvc/views/partial.md	Partial views in ASP.NET Core
aspnetcore/mvc/views/razor.md	aspnetcore/mvc/views/razor

[lootle1]

@tdykstra @wadepickett this PR is ready for review. Top comment has an overview. Note I ran into an issue on the previous PR (also in top comment) so pushed all those changes here along with the new ones.

Let me know if any additional change requests, thank you!

[wadepickett]

Looks great! I found a few small item and one medium one to fix before we merge.

[lootle1]

Thanks @wadepickett, your changes looks great to me and have committed. This PR is all set from my vantage point!

[wadepickett]

Approved. Looks good, thanks!