Update UserDirectoryPHP wiki page for Xerus and beyond

[Kus]

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Dear friends,

The wiki page at https://wiki.ubuntu.com/UserDirectoryPHP is immutable.
With the glorious path forward with PHP7 as the default PHP,
perhaps it is time to update the wiki page as well?

I apologize in advance if this is not the right place.

Thank you!

Sincerely,
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