Remove the superfluous reference to identifier_tls_alpn

man/en/acmed.toml.5

@@ -423,8 +423,6 @@ Mostly used in hooks with multiple types.
 Array containing all the environment variables.
 .It Cm identifier Ar string
 The identifier name whom ownership is currently being validated.
-.It Cm identifier_tls_alpn Ar string
-The identifier name whom ownership is currently being validated, in a form suitable for the TLS ALPN challenge.
 .It Cm is_clean_hook Ar bool
 False
 .It Cm proof Ar string
@@ -460,8 +458,6 @@ Name of the file containing the proof. This is not a full path and does not incl
 prefix.
 .It Cm identifier Ar string
 The identifier name whom ownership is currently being validated.
-.It Cm identifier_tls_alpn Ar string
-The identifier name whom ownership is currently being validated, in a form suitable for the TLS ALPN challenge.
 .It Cm is_clean_hook Ar bool
 False
 .It Cm proof Ar string