Around Nerves, the words "signing certificate", "CA certificate",
"issuer certificate" and "signer certificate" are used mostly
interchangably. This commit changes documentation and unreleased mix
helper options to be consistent with the term "signer certificate".
Around Nerves, the words "signing certificate", "CA certificate", "issuer certificate" and "signer certificate" are used mostly interchangably. This commit changes documentation and unreleased mix helper options to be consistent with the term "signer certificate".