[x/go.dev] revise about
[x/go.dev] revise about

Change-Id: I1d9d02b1b9a1a709df045739192c377f5e154a95

X-GoDev-Commit: cfa1ffbbde2ff344e5bbb29b0762f913c6683874

golang/website,golang/website,golang/website,golang/website,golang/website,golang/website,golang/website