D21925: Update joystick kcm documentation for game controllers

[Noah Davis]

ndavis marked an inline comment as done.

REPOSITORY
  R119 Plasma Desktop

BRANCH
  joystick-settings (branched from master)

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

To: ndavis, #plasma, #documentation, yurchor
Cc: yurchor, ngraham, 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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