scrapy/scrapy — pull request #534 by kmike (2014-01-15 11:41:17+00:00)
Title: Update leaks.rst: there is now only a single spider in a process.

See http://doc.scrapy.org/en/latest/topics/leaks.html - it seems these docs were written in assumption there can be several spiders executed in a single process, which is no longer a common thing to happen.