fix crossrefs

branches: 1.13.44; 1.13.48;
Convert TNF licenses to new 2 clause variant

branches: 1.12.32; 1.12.34;
Another new sentence on a new line.
Remove unnecessary .Pp.

Document the bootblock split into std and milan directories.

Sort sections, separate Xrefs by a comma.

note that the path for installboot is /usr/mdec/installboot in SYNOPSIS

Use standard section headers.

Add arch to Dt, whitespace fixes; Nm doesn't need an argument.

Add bootpref(8) to 'SEE ALSO' section.

branches: 1.5.4;
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).

Assign my copyrights to TNF.

macroize BSD, NetBSD, FreeBSD and misc cleanup

Some minor nits.

branches: 1.1.1;
Initial revision