It is unlikely that someone uses an unsupported version of Django, and at his own risks. If ever someone does, it must be his concern to know if a feature exists in the given version.
Considering the above, it is useless to mention specificities of an unsupported version.
This kind of block is useless because no sane person uses Django < 1.6.
This kind of block is useless because no sane person uses Django < 1.8.
This also goes for topics. At the time of writing this example, Class based views states supported versions are
1.3-1.9. We can safely assume this is actually equivalent to
All versions. This also avoids upgrading all topics supported versions every time a new version is released.
Current supported versions are: