Summarising ... http://f.a.o/docs_0_60/ will refer to the documentation for Forrest V0.6 http://f.a.o/docs_0_70/ will refer to the documentation for Forrest V0.7 http://f.a.o/docs_0_80/ will refer to the documentation for Forrest V0.8
There will no longer be the "current version" at f.a.o/docs/ Assuming that FOR-544 goes ahead: http://f.a.o/pluginDocs/plugins_0_70/index.html will be the index of valid plugins for the 0.7 version of Forrest http://f.a.o/pluginDocs/plugins_0_80/index.html will be the index of valid plugins for the 0.8 version of Forrest http://f.a.o/pluginDocs/plugins_0_70/PLUGINNAME will be the latest docs for the most recent release of the indicated plugin for version 0.7 of Forrest http://f.a.o/pluginDocs/plugins_0_80/PLUGINNAME will be the latest docs for the most recent release of the indicated plugin for version 0.8 of Forrest