[website] Ubuntu download: Correct Ubuntu downloads instructions

[Rosanne DiMesio]

Revises instructions to no longer identify the PPA as WineHQ's and to clarify the support status of Ubuntu derivatives. Fixes bugs 34299 and 33549. 

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 templates/en/download/ubuntu.template | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)
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