fixup! fixup! fixup! X509_dup.pod: add caveat that extra data is not … #1568

Job	Run time
cygwin (windows-2019, win64, -DCMAKE_C_COMPILER=gcc --strict-warnings no-fips)	30m 29s
minimal (windows-2019)	8m 10s
plain (windows-2019)	15m 20s
minimal (windows-2022)	8m 54s
shared (windows-2019, win64, enable-fips)	27m 14s
plain (windows-2022)	15m 23s
shared (windows-2019, win32, --strict-warnings no-fips)	29m 32s
shared (windows-2022, win64, enable-fips)	26m 28s
shared (windows-2022, win32, --strict-warnings no-fips)	29m 49s
	3h 11m 19s

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