[cups.bugs] [LOW] STR #3260: enhance cupsd.conf documentation regarding "DirtyCleanInterval"

[jsmeix.suse]

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[STR New]

According to
http://www.cups.org/str.php?L2684
DirtyCleanInterval is new in CUPS 1.4
and therefore it should be marked accordingly
in the documentation for cupsd.conf
so that it is more obvious what is new.

Furthermore the meaning of "DirtyCleanInterval 0"
could be described.

Link: http://www.cups.org/str.php?L3260
Version: 1.4rc1