[Nutch Wiki] Trivial Update of "FAQ" by Frungi

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The "FAQ" page has been changed by Frungi:
http://wiki.apache.org/nutch/FAQ?action=diff&rev1=131&rev2=132

Comment:
punctuation

   * Or send the process a unix STOP signal. You should be able to index the part of the segment for crawling which is allready fetched. Then later send a CONT signal to the process. Do not turn off your computer between! :)
  
  ==== How many concurrent threads should I use? ====
- This is dependent on your particular set-up, unless one understands system/network environment variables it is impossible to accurately measure thread performance. The Nutch de-facto is an excellent start point. 
+ This is dependent on your particular set-up; unless one understands system/network environment variables it is impossible to accurately measure thread performance. The Nutch de-facto is an excellent start point. 
  
  ==== How can I force fetcher to use custom nutch-config? ====
   * Create a new sub-directory under $NUTCH_HOME/conf, like conf/myconfig