proposal: update profile label proposal to reflect actual implementation
proposal: update profile label proposal to reflect actual implementation

Fixes golang/go#17280

Change-Id: Ia62e223cc8634d1c89987e3b3a95ab99e3fae0ba
Reviewed-on: https://go-review.googlesource.com/43530
Run-TryBot: Michael Matloob <4562438b12c14e81a47550acde616ff328a909f8@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Austin Clements <7ea35d812706d9213868749011af1ed4fa2f6aa0@google.com>

golang/proposal,golang/proposal