Fix preamble to match order set out by mdoc(7). Discussed with wiz.

branches: 1.19.28;
Sort options.

Add a -g switch to retrieve the current vt.

Fix typo reported by adam@.

Sort options. New sentence, new line.

Add a -s flag to switch between terminals.
Misc KNF.

branches: 1.14.6;
.Nm does not need a dummy argument ("") before punctuation or
for correct formatting of the SYNOPSIS any longer.

add copyright notices

Sort sections.

Xref wskbd 4, not 8.

Split the SYNOPSIS into three cases, since not all options can be used
together. The three cases are:

Adding a virtual terminal (can take -t/-e to configure)
Deleting a virtual terminal (can take -F to force)
Adding or removing a keyboard or multiplexor (can take neither of the above,
and the index is optional)

Use \(mu for a multiplication sign.
Use .Ql for literals in running text.
Use .Ar when referring to arguments.

Put sections in the canonical order.
Correct wskbd(4) reference.

replace references to /etc/rc.wscons with /etc/rc.d/wscons

branches: 1.6.8;
Make it possible to add a mux.

update for keyboard attachment

change:
.Sh "SEE ALSO"
to:
.Sh SEE ALSO
The doc macros check for the latter (actually just for 'SEE' as the first
argument to .Sh) to set the section header SEE ALSO flag, which modifies
some behaviour (e.g. references done with .Rs/.Re).

add some notes and an example

Xref wsconsctl, wsfontload

add a tool to add/delete virtual screens at runtime