Decide on the exact formatting of links in Additional resources

[aneta-petrova]

Raised in #4096 (comment)

Per https://github.com/jhradilek/asciidoctor-dita-vale:

In DITA 1.3, the element can only contain links. Format additional resources as an unordered list, remove lines that do not contain a link or a cross reference, and remove any text that precedes or follows a link or a cross reference.

This is a significant diversion from how we currently adds links. For example, our current convention says this:

• {AdministeringDocURL}Logging_and_Reporting_Problems_admin[Logging and reporting problems] in {AdministeringDocTitle}

(the target doc title is outside of the link label)

Possible solutions could be this:

• {AdministeringDocURL}Logging_and_Reporting_Problems_admin[Logging and reporting problems in {AdministeringDocTitle}]

(the target doc title is part of the link label)

or this:

• {AdministeringDocURL}Logging_and_Reporting_Problems_admin[Logging and reporting problems]

(no mention of the target doc title or website)

[maximiliankolb]

I like showing the name of the guide in italics, but I am OK either way.