Added link to 'batteries included' explanation in docs/add_ons.txt
Added link to 'batteries included' explanation in docs/add_ons.txt

git-svn-id: 4f9f921b081c523744c7bf24d959a0db39629563@3509 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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