doc: drop "explicitly given" from push.default description

The documentation for push.default mentions that it is used if no
refspec is "explicitly given". Let's drop the notion of "explicit" here,
since it's vague, and just mention that any refspec from anywhere is
sufficient to override this.

I've dropped the mention of "explicitly given" from the definition of
the "nothing" value right below, too. It's close enough to our
clarification that it should be obvious we mean the same type of "given"
here.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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