doc: git-log: fix description list
b27be108c89 (doc: git-log: convert log config to new doc format,
2025-07-07) intended to convert a paragraph describing the different
options for `log.decorate` into a description list. But the literal
block syntax was used by mistake.
Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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