[Spamassassin Wiki] Update of "IncreaseAccuracy" by Darxus

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The "IncreaseAccuracy" page has been changed by Darxus:
http://wiki.apache.org/spamassassin/IncreaseAccuracy?action=diff&rev1=11&rev2=12

Comment:
Update false positive/negative rate ratio with/without network tests

  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.
  
  == Enable network rules ==
- This is the default, but disabling network rules (including DNS rules) causes SpamAssassin to be wrong on about 5 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.
+ 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.
  You should run a local caching DNS server for efficiency.
  
- As of 2011-03-24, without network tests, SpamAssassin is wrong 5.35 times as often on non-spam, and 4.25 times as often on spam.
+ As of 2011-12-21, without network tests, SpamAssassin is wrong 2.58 times as often on non-spam, and 3.40 times as often on spam.
  
  == Install Pyzor and Razor ==
  These are two helper applications with useful (network) rules.  If they're installed correctly, the debug output of SpamAssassin will include: