The buildmode docs mention exported functions, but don't say anything
about how to export them.  Mention the cgo tool to make this somewhat
clearer.

Fixes #11955.

Change-Id: Ie5420445daa87f5aceec6ad743465d5d32d0a786
Reviewed-on: https://go-review.googlesource.com/13080Reviewed-by: Russ Cox <rsc@golang.org>