acme: reword the godoc to be more human readable
acme: reword the godoc to be more human readable

Updates #21902

Change-Id: I2988ba001450339d196da3a0f0687897e807e886
Reviewed-on: https://go-review.googlesource.com/64090
Reviewed-by: JBD <347c19a639ce752a783b4ea325d6539ab4b4a262@google.com>

golang/crypto,golang/crypto,ScriptRock/crypto,golang/crypto,ScriptRock/crypto