Gerd Hoffmann 649ae1040d usb: update docs
xhci is rock solid meanwhile.  So move it up in the docs and feature it
as prefered usb host adapter, instead of the old shy version saying "you
might want try ...".

While being at it rework the text on ehci and companion controllers too.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-id: 20180605132915.3640-1-kraxel@redhat.com
2018-06-12 12:06:52 +02:00
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