config.txt: clarify that add.ignore-errors is deprecated

The old text gave an impression that even in a new repository using
old form might be safer.  Only Git from pre 1.7.0 days choke on the
correctly named variable, which is ancient by today's standard.

We have no intention to remove the support for deprecated ones, but
let's make sure that we do not give room for confused questions such
as "why does core.sparse-checkout not work, when add.ignore-errors
does?"

Signed-off-by: Junio C Hamano <gitster@pobox.com>

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