Document sendemail.envelopesender configuration
Document sendemail.envelopesender configuration

Signed-off-by: Ask Bjørn Hansen <1c8f09270fc33a393af3eaf0b2ebf58eb9bbbcc2@develooper.com>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git