[Patch] Update 'How to' to clarify computation of datadir

[Jeremy White]

The attached patch specifies that a system wide
installation should compute datadir by using the
first writable element of $XDG_DATA_DIRS
(or sysconfdir from the first writeable element
of $XDG_CONFIG_DIRS), as previously discussed.

The spec is clearly lacking, so I request that this
either be applied, or a clear alternate be suggested.

Cheers,

Jeremy
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