UnmanagedCallersOnlyAttribute.CallConvs and CallConvSuppressGCTransition

### Type of issue

Missing information

### Description

I find the documentation for `UnmanagedCallersOnlyAttribute.CallConvs` to be unintentionally misleading. It specifies that the valid values are `CallConv*` types. However, `CallConvSuppressGCTransition` is NOT valid value for the calling convention in this context - supressing GC transition is not allowed for reverse P/Invokes, which is the whole purpose of the `UnmanagedCallersOnlyAttribute` attribute. Moreover, the "See also" section specifically points to `CallConvSuppressGCTransition` documentation with a link to add to the confusion.

The documentation for `CallConvSuppressGCTransition` doesn't directly mention that it's only meant to be used for function pointers to unmanaged code. Instead it links to the description of the `SuppressGCTransition` attribute which lists the limitations for its use. Notably, I would be fine with the indirect link here if it was not for the documention of `UnmanagedCallersOnlyAttribute.CallConvs`. It's unreasonable to expect a documentation reader to go through two links and then read the remarks section to discover that some value combination is invalid.

### Page URL

https://learn.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.unmanagedcallersonlyattribute.callconvs?view=net-9.0#system-runtime-interopservices-unmanagedcallersonlyattribute-callconvs

### Content source URL

https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.Runtime.InteropServices/UnmanagedCallersOnlyAttribute.xml

### Document Version Independent Id

953bcf74-4793-6c98-5e89-c73dd0d748ff

### Platform Id

436c4c22-d112-467c-323f-85c5547d49db

### Article author

@dotnet-bot