[Nutch Wiki] Trivial Update of "bin/nutch_readdb" by MarkusJelsma

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The "bin/nutch_readdb" page has been changed by MarkusJelsma:
http://wiki.apache.org/nutch/bin/nutch_readdb?action=diff&rev1=13&rev2=14

  '''-stats''': This prints the overall statistics to System.out.
  
  '''-dump <out_dir>''': Enables us to dump the whole crawldb to a text file in any <out_dir> we wish to specify.
+ '''[-regex <expr>]: filter records with a regular expression
+ '''[-status <status>]: filter records by CrawlDatum status
  
  '''-topN <nnnn> <out_dir> [<min>]''': This dumps the top <nnnn> urls sorted by score relevance to any <out_dir> we wish to specify. If the [<min>] parameter is passed in the command the reader will skip records with scores below this particluar value. This can significantly improve retrieval performance of statistics or crawldb dump results.