Add naming tips for getter-likes/selector-likes

[cynthia]

In w3ctag/design-reviews#292 it came to our attention that reader APIs which do some form of filtering should have a consistent keyword associated with it.

Selectors follow the naming convention "query" something, is this something we can live with? (I don't have strong opinions on one or the other)

[annevk]

Doesn't it depend on the kind of filtering? filter / match / query could all make sense (and have), depending on the context.

[cynthia]

It could be. I raised it so we can do something about it - this issue has come up multiple times.

[annevk]

I guess I'm saying that some exposition on the problem would help as I'm not sure I follow.

[LeaVerou]

Echoing what @annevk is saying, I think a list of examples of reader APIs which do some form of filtering would really help move discussion forwards.