[DOCS] Documenting timezone setting in initdb

[Daniel Gustafsson]

Setting the time zone of the newly created cluster from initdb via the
environment variable isn't documented in the initdb section (but very handy).
Attached is a patch adding a mention of TZ in the Environment section.

Unless objections I'll add it to the open commitfest.

        cheers ./daniel

initdb-doc-timezone.patch
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