Google internally runs a godoc server serving docs for the standard library + all of
Google $GOPATH (all internal Google Go code).

In many cases, we'd like to mention the Google-specific libraries or ways of doing
things from the standard library docs.

It would be nice if there were a file we could maintain that appended company-specific
doc annotations to the standard library on at least:

-- packages
-- funcs
-- types
-- specific fields on struct types