Updated docs/cache.txt section on 'dummy caching' to use the same example format as the other backends
Updated docs/cache.txt section on 'dummy caching' to use the same example format as the other backends

git-svn-id: 4f9f921b081c523744c7bf24d959a0db39629563@6049 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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