Also, reorder packages so the list is in alphabetical order.

Fixes #32914.

Change-Id: Ifa504cb7e48df31ba6dc0e5756148430b59fa139
Reviewed-on: https://go-review.googlesource.com/c/go/+/187797Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Andrew Bonventre <andybons@golang.org>