Refactor XML comments for clarity in Microsoft.IdentityModel.JsonWebTokens and Microsoft.IdentityModel.Protocols.OpenIdConnect

[joegoldman2]

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Description

Continuation of #2676. This PR enhances the XML documentation across Microsoft.IdentityModel.Protocols.JsonWebTokens.

[keegan-caruso]

@joegoldman2 This is close, can you fix the error shown in CI and then we can take this.

[keegan-caruso]

thanks!