go/packages: fix docs
go/packages: fix docs

Change-Id: Ife879995fd1a8f23821efefe6970a0e907f2fb12
Reviewed-on: https://go-review.googlesource.com/132600
Run-TryBot: Todd Neal <2c763d726a8c2f6afda9be7e0e56a2caa6bb5e6b@tneal.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Kevin Burke <685caccd7011cfe58b8f9ef79ff9dca388f03c79@inburke.com>

golang/tools,golang/tools,golang/tools,golang/tools,golang/tools