The documentation was inaccurate. The [crawlers] stanza does not, in fact, exist.
We've just corrected the documentation; read it here:
http://www.splunk.com/base/Documentation/latest/Admin/Findmorethingstomonitorwithcrawl
Also, refer to the crawl.conf spec file here:
http://www.splunk.com/base/Documentation/latest/Admin/Crawlconf
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