netlink(4): add snl(3) to See Also section

[p.mousavizadeh_protonmail.com]

Summary

I wanted to use netlink, and after reading existing
userland code I found the snl(3) library.
However, there would be a considerable time savings
if netlink(4) included a reference to snl(3) so developers
could discover these libraries faster.
Also, I fixed some lint warning in these manuals.

Test Plan

mandoc -Tlint

[pauamma_gundo.com]

I'm all for making userland libraries easier to learn about.

Perhaps, to make it even easier in this case, you could add a mention of what snl(3) is good for, for example in the first paragraph of section "PROTOCOL DESCRIPTION". Something like:

In addition, wrapper library
.Xr snl 3
can make parsing or assembling messages easier.

What do you think?

[p.mousavizadeh_protonmail.com]

In D53786#1228565, @pauamma_gundo.com wrote:

Perhaps, to make it even easier in this case, you could add a mention of what snl(3) is good for, for example in the first paragraph of section "PROTOCOL DESCRIPTION". Something like:

In addition, wrapper library
.Xr snl 3
can make parsing or assembling messages easier.

What do you think?

Personally, I prefer a manual to stick strictly to its own contents and avoid referencing other libraries in the main text which keeps it concise and easier to read. for me it's easier to jump between manuals than within a single man page.
IMHO, the "See Also" section should be sufficient.