go/packages: update doc for name= queries
go/packages: update doc for name= queries

Change-Id: I2ba387703ae1f31e7dff271007607f377701f7dd
Reviewed-on: https://go-review.googlesource.com/c/155941
Reviewed-by: Alan Donovan <7069e9552f9d110b0a0f326b96f22f63fb99dfc1@google.com>

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