doc: add link to `net.Server` in tls.md
Checklist
-
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
doc
Description of change
I was looking through the tls
docs and it referenced the net
docs without linking it. This change adds the link.
I also did a quick grep through the other docs for similar phrases, and didn't find any instances to fix similar to this one.