gpg: Improve API documentation.
* g10/seskey.c (make_session_key): Improve documentation. (encode_session_key): Improve documentation. * g10/encrypt.c (encrypt_seskey): Remove gratuitous initialization. * g10/dek.h (DEK): Improve documenation.
- Signed-off-by: Neal H. Walfield <neal@g10code.com>