[Spamassassin Wiki] Update of "ImproveAccuracy" by Darxus

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The "ImproveAccuracy" page has been changed by Darxus:
http://wiki.apache.org/spamassassin/ImproveAccuracy?action=diff&rev1=9&rev2=10

Comment:
Clarify that Debian defaults to sa-updates disabled

  == Run sa-update daily ==
  This is often included in SpamAssassin packaging, but sa-update should be run from cron daily, to get the latest SpamAssassin rules which are generated every day.
  
- (On Debian based systems, set "CRON=1" in /etc/default/spamassassin .)
+ (On Debian based systems, set "CRON=1" in /etc/default/spamassassin - this is not the default.)
  
  == Enable network rules ==
  This is the default, but disabling network rules (including DNS rules) causes SpamAssassin to be wrong on about 3 times more emails.  Network tests may have been disabled by running spamassassin or spamd with the command line arguments {{{-L}}} or {{{--local}}}.  DNS rules may have been disabled with "{{{dns_available no}}}" in local.cf.