Much of this documentation has been collated from other sources,
but this pulls it all into one coherent and public structure in
a way that allows us to peer review changes.
Change-Id: Ic24a59bb92b27ec85d2f57affcf2eb396c9de3c0
Reviewed-on: https://go-review.googlesource.com/c/tools/+/191741
Reviewed-by: Rebecca Stambler <rstambler@golang.org>
