add synopsis to man byobu-ctrl-a

man(1) of `byobu-ctrl-a` shows optional arguments for setting ctrl-a behavior non-interactively
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.SH NAME
byobu\-ctrl\-a \- Configure Byobu's ctrl-a behavior
.SH SYNOPSIS
.B byobu-ctrl-a
['screen'|'tmux']
[key]
.SH DESCRIPTION
\fBbyobu\-ctrl\-a\fP is an interactive program that allows a user to configure the behavior of the 'ctrl-a' key sequence.