D28304: Use bold italic at 100% for sect4 titles, and bold 100% for sect5 titles

[Yuri Chornoivan]

yurchor edited the test plan for this revision.

REPOSITORY
  R238 KDocTools

REVISION DETAIL
  https://phabricator.kde.org/D28304

To: yurchor, #documentation, danders
Cc: kde-frameworks-devel, kde-doc-english, LeGast00n, cblack, gennad, 
fbampaloukas, GB_2, michaelh, ngraham, bruns, skadinna