[release-branch.r58] document release.r58

««« CL 4643058 / 0a5e3e664637
document release.r58

R=rsc, r, bsiegert
CC=golang-dev
https://golang.org/cl/4643058
»»»

R=golang-dev
CC=golang-dev
https://golang.org/cl/4641084
2 files changed