Add some basic info about GI overrides to the documentation
Add some basic info about GI overrides to the documentation

So that people have an idea about their existence.

rhinstaller/libblockdev,rhinstaller/libblockdev,rhinstaller/libblockdev,vpodzime/libblockdev,atodorov/libblockdev,vpodzime/libblockdev,atodorov/libblockdev,atodorov/libblockdev,vpodzime/libblockdev