New Bro Manual Development Edition and basic.css to fix btest output overflow problem (Update 1).
Merge branch 'master' into topic/jsiwek/review-rafael-bro-manual-changes
Pass over doc xref links and linking style.
Reformat line width of some docs (i.e. `fmt -72`).
Add unit tests for new Bro Manual docs.
Merge remote-tracking branch 'origin/topic/jsiwek/review-rafael-bro-manual-changes'

* origin/topic/jsiwek/review-rafael-bro-manual-changes:
  Add unit tests for new Bro Manual docs.
  Reformat line width of some docs (i.e. `fmt -72`).
  Pass over doc xref links and linking style.
  New Bro Manual Development Edition and basic.css to fix btest output overflow problem (Update 1).

BIT-1118 #merged
Updating submodule(s).

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