Minor update to documentation for many-to-many filter() calls.
Minor update to documentation for many-to-many filter() calls.

Removed a potential ambiguity when describing how multiple conditions in one
filter() call are handled.

git-svn-id: 4f9f921b081c523744c7bf24d959a0db39629563@9958 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Smarsh/django,alex/django-old,disqus/django-old,disqus/django-old,sam-tsai/django-old,alex/django-old,jamespacileo/django-france,bfirsh/django-old,mitsuhiko/django,Instagram/django,mitsuhiko/django,sam-tsai/django-old,jamespacileo/django-france,t11e/django,t11e/django,Smarsh/django,Smarsh/django,alex/django-old,Smarsh/django,skevy/django,django-nonrel/django-nonrel,Instagram/django,jamespacileo/django-france,bfirsh/django-old,mitsuhiko/django,bfirsh/django-old,t11e/django,skevy/django,django-nonrel/django-nonrel,django-nonrel/django-nonrel,sam-tsai/django-old,skevy/django,disqus/django-old,sam-tsai/django-old,Instagram/django