Mention $pgp_decode_command for $pgp_check_gpg_decrypt_status_fd

It scans $pgp_decode_command for inline and application/pgp mime
types.
2 jobs for stable in 13 minutes and 7 seconds
Status Job ID Name Coverage
  Build
passed #80158440
gnutls

00:12:58

passed #80158439
openssl

00:13:07