Certificate-Weakening TlsOptions have no effect on web socket connections

I noticed that the "certificate weakening" TlsOptions like IgnoreCertificateChainErrors, IgnoreCertificateRevocationErrors, AllowUntrustedCertificates and CertificateValidationCallback have no effect when using web socket connections.

I understand this is because the underlying api (System.Net.WebSockets) does not support this (at least not in all target frameworks), but I think it should be noted somewhere - that would have saved me several hours of trial and error...

Inspect the project documentation for TlsOptions and websocket connections, starting with the existing descriptions of certificate validation settings. Document that these certificate-weakening options have no effect for websocket connections because of the underlying System.Net.WebSockets API; done means users can find and understand this limitation.

Written by the indexing model from the issue text.