services.5: Clarify the formatting of a service line

[0mp]

Summary

While here:

• Fix a typo in Nd.
• Link to the RFC 6335.
• Link to Service Name and Transport Protocol Port Number Registry.

MFC after: 1 week

[ziaee]

share/man/man5/services.5

36

(no change requested here)
It seems like we capitalize Internet slightly more often than not, but for context, this one is highly contested, The tl;dr is that FAANG, NIST, AP, APA, and Chicago manual of style say it shouldn't be capitalized, while MLA, IETF, and ISOC say it should be. There is even a Wikipedia article on it:

https://en.wikipedia.org/wiki/Capitalization_of_Internet

58

1. you wrote yourself in style.mdoc that we do not markup commands inside a literal block.
2. delimiters are not command modifiers, as we have been discussing in the other review.
3. i think the ... is optional.

114

(no change requested here, just commentary)

We cite RFCs wildly differently across different manpages, I wish we could figure out what is the actual correct way. I could send a mail to mandoc and ask what they think? Alternatively, i heard a rumor that the original mandoc author is coming to bsdcan, maybe we could ask him together?