spec: clarify nil case in type switches

spec: clarify nil case in type switches

The old wording seemed to imply that nil is a kind of type.
Slightly reworded for clarity.

Fixes #21580.

Change-Id: I29898bf0125a10cb8dbb5c7e63ec5399ebc590ca
Reviewed-on: https://go-review.googlesource.com/58490
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Rob Pike <r@golang.org>