Update dotnet run file.cs spec with new ignored directives syntax

[jjonescz]

No description provided.

Pull Request Overview

This PR updates the dotnet run file documentation to reflect the new ignored directives syntax for project metadata. Key changes include updating the description of entry-point file checks, renaming and reformatting directive examples (using "#:" prefixes instead of "#"), and clarifying how these directives are translated into MSBuild project elements.

Comments suppressed due to low confidence (2)

documentation/general/dotnet-run-file.md:182

• [nitpick] Consider using a single space between the directive and its value for consistency with other examples.

#:sdk      Microsoft.NET.Sdk.Web

documentation/general/dotnet-run-file.md:211

• [nitpick] Revise the bullet point formatting to ensure consistency with the previous bullet, which could improve clarity.

- error on multiple `#:sdk` directives.