[flashrom-gerrit] Change in flashrom[stable]: Add modification date to manpage header instead of the section

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Change subject: Add modification date to manpage header instead of the section
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/flashrom-customrules/755/ : SUCCESS

https://qa.coreboot.org/job/flashrom_gerrit/683/ : SUCCESS