handbook/desktop: fix internal xrefs

[concussious.bugzilla_runbox.com]

Summary

Internal crossreferences in the FreeBSD handbook using crossref: are currently broken on PDF output. The official docs [0] say to use <<here-is-the-xref>>. Most xrefs are already written in that notation, they are clean and work great. Update the rest of the remaining xrefs in this chapter to this notation.

[0] : https://docs.asciidoctor.org/asciidoc/latest/macros/xref/

Related bug : https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266107

Similar fix for cutting-edge : https://reviews.freebsd.org/D46264
Similar fix for boot : https://reviews.freebsd.org/D46263
Similar fix for bsdinstall : https://reviews.freebsd.org/D46262
Similar fix for audit : https://reviews.freebsd.org/D46261
Similar fix for basics : https://reviews.freebsd.org/D46260
Similar fix for advanced networking : https://reviews.freebsd.org/D46258

Test Plan

https://reviews.freebsd.org/D46264

[fernape]

See https://reviews.freebsd.org/D46266#inline-277720 before working on this

[concussious.bugzilla_runbox.com]

Thank you sir. I have tried several things to no avail and I am still working on this issue.

[fernape]

In D46265#1059046, @concussious.bugzilla_runbox.com wrote:

Thank you sir. I have tried several things to no avail and I am still working on this issue.

I have something that works in all outputs, but it needs some clean up.
I'll keep you posted.

[concussious.bugzilla_runbox.com]

Fernape has fixed the internal macro in D46480, so I'm going to close this.