Bring it up to date with recent terminology, mention new approaches
such as in Rust, and link to the new blog post.

Change-Id: I1d0b121e6f8347c3cf2c8ca0d8adc8285ce59ef1
Reviewed-on: https://go-review.googlesource.com/124475Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>