Clarified that win_sparkle_init() is non-blocking.
Clarified that win_sparkle_init() is non-blocking.

bristol-instruments/winsparkle,CaptainJackJJ/SmpUpdater,nickdademo/winsparkle,dsuess/winsparkle,dsuess/winsparkle,Herve-M/winsparkle,alamaison/winsparkle,drizt/winsparkle,artillery/winsparkle,Herve-M/winsparkle,artillery/winsparkle,alamaison/winsparkle,drizt/winsparkle,bristol-instruments/winsparkle,CaptainJackJJ/SmpUpdater,nickdademo/winsparkle