docs: use "currently" for the present time

In many languages, the adverb with the root "actual" means "at the
present time."  However, this usage is considered dated or even archaic
in English, and for referring to events occurring at the present time,
we usually prefer "currently" or "presently".  "Actually" is commonly
used in modern English only for the meaning of "in fact" or to express a
contrast with what is expected.

Since the documentation refers to the available options at the present
time (that is, at the time of writing) instead of drawing a contrast,
let's switch to "currently," which both is commonly used and sounds less
formal than "presently."

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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