D26827: Fix doxygen style

[Vlad Zahorodnii]

zzag added a dependency: D26826: Capitilize "mode" in Sizemode enum.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D26827

To: zzag
Cc: kwin, Orage, LeGast00n, The-Feren-OS-Dev, jraleigh, zachus, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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