[Android] Improve the widgets provider documentation

[Nicolas Pomepuy]

vlc-android | branch: master | Nicolas Pomepuy <nicolas at videolabs.io> | Mon May  9 11:02:30 2022 +0200| [37e5e2f528afcb6133a783163099a78d628f8a0a] | committer: Duncan McNamara

Improve the widgets provider documentation

> https://code.videolan.org/videolan/vlc-android/commit/37e5e2f528afcb6133a783163099a78d628f8a0a
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 .../vlc/widget/MiniPlayerAppWidgetProvider.kt      | 98 ++++++++++++++++++----
 1 file changed, 81 insertions(+), 17 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/37e5e2f528afcb6133a783163099a78d628f8a0a