More improvements for Kwave doc

[Antoni Bella Pérez]

  Hi,

  I have reviewed the less technical part of the documentation (missing 
'Plugin Reference') and I request to apply attached patch.

  Common changes:
# <guimenu>Windows</guimenu>      -> <guimenu>Window</guimenu>
# <keycap>cursor Left</keycap>    -> &Left;
# <keycap>cursor right</keycap>   -> &Right;
# Ctrl                            -> &Ctrl;
# <keycap>Page up</keycap>        -> &PgUp;
# <keycap>Page down</keycap>      -> &PgDn;
# <keycap>Space</keycap>          -> &Space;
# <keycap>Home</keycap>           -> &Home;
# <keycap>End</keycap>            -> &End;
# left mouse button               -> &LMB;
# mickey mouse efect              -> Mickey Mouse efect (proper noun)
# <keycap>Alt</keycap>            -> &Alt;
# GUI                             -> &GUI;
    <para>gui</para>              -> <para>&GUI;</para> (see)
# URI                             -> &URI;
# Tab                             -> 	
# URL                             -> &URL;
# tab mode                        -> Tab mode (unify the style)

 Improves (GUI sync):
# title: Zooming in and out ('listitem' reorder -- without button images?)
# title: Scrolling left and right ('listitem' reorder and adding 'goto 
position' -- without button images?)
# title: Selecting sample ('listitem' reorder and fixes)

  Regards
  Toni
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