Figure out XML docs for positional records

[jcouv]

How do we specify xml docs for positional members (which define both parameters and properties)?

record Person(string First, string Last);

[jcouv]

From discussion on 7/15/2020, we're going to go with a minimalist approach to start:

1. compiler will carry over <param> tags from record types to constructor parameters
2. IDE may choose to adjust inheritance logic so that properties show some information from associated parameter
3. synthesized methods (Equals and such) won't include any boilerplate documentation

[333fred]

Make sure that CS1591 (missing XML comments) is not reported for these carry-overs.

[RikkiGibson]

Is further action needed by the compiler team for 16.8?

[jcouv]

@RikkiGibson Yes, we'd like to do (1) from plan above: "compiler will carry over tags from record types to constructor parameters".
This can be pushed out to 16.9 if necessary.