Monospaced identifiers could end up running over if latex was not able to find a place to break the line. Using sloppypar forces breaks so monospaced identifiers don't run over or get broken up.
Also add vspace to admonitions so they have some separation from the prior text.
Since links are not possible in the command line help just display the name of the linked section.
Also, during reference text rendering there is no out key so make sure it is defined before trying to use it.
This means the same text will appear in both places, which should make it easier to find.
Also update the link code to allow both page and section to be specified rather than only one or the other.
This is consistent with the way BackRest and BackRest test were renamed way back in 18fd2523.
More modules will be moving to pgBackRestDoc soon so renaming now reduces churn later.
