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: 554f83ef17aa7291f84efa897c1acfc5d0035373@9958 bcc190cf-cafb-0310-a4f2-bffc1f526a37

svn2github/django,svn2github/django,svn2github/django