python: clarify documentation for verify argument for Context.decrypt()
python: clarify documentation for verify argument for Context.decrypt()

It's easy to miss that verify can take a list of keys.  Make it more
obvious to the average python dev who reads docstrings.

Signed-off-by: Daniel Kahn Gillmor <b1356865a0eefd1fb76a8b663fad027be4bc9b61@fifthhorseman.net>

gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme