small improvements to the documentation

[IBG-Projects]

Web Components, Default Theme

1. https://www.vidstack.io/docs/wc/player/api/video-quality?styling=default-theme
   "useVideoQualityOptions" url target => error 404

2. https://www.vidstack.io/docs/wc/player/components/menus/menu?styling=default-theme

fold-out code box:

audio-submenu,
captions-submenu,
quality-submenu,
speed-submenu

class .vds-menu of the element <media-menu> is missing, exists only for first empty menu.
this should also affect the .vds-button of <media-menu-button> which is also missing in the other examples.

3. it would be good if the home page had a ready-made testable vidstack player so that you don't have to search for the player at sub sub sub page default-layout https://www.vidstack.io/docs/wc/player/components/layouts/default-layout?styling=default-theme#previews. Users visit the documentation page to get information and test the player, but if the player cannot even be tested directly, this is not ideal.