D21925: Update joystick kcm documentation for game controllers

[Noah Davis]

ndavis edited the summary of this revision.

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D21925

To: ndavis, #plasma
Cc: plasma-devel, kde-doc-english, LeGast00n, jraleigh, gennad, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, skadinna, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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