D21925: Update joystick kcm documentation for game controllers

[Nathaniel Graham]

ngraham added a reviewer: Documentation.
ngraham added inline comments.

INLINE COMMENTS

> index.docbook:71
>  <para>
>  The plotted location of the X and Y axes of the joystick. Enable <guibutton>Show trace</guibutton>
>  to plot the path of the joystick from one point to another.

`of the joystick` -> `of the game controller's joystick`?

REPOSITORY
  R119 Plasma Desktop

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

To: ndavis, #plasma, #documentation
Cc: 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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