Trying to make a short explaination with some oversimplification:
Each build has to be compiled = making plain text files into code executable/readable by a given camera.
Camera ability to support a particular feature is listed in those text files. You will find a list for
nightly builds here:
http://builds.magiclantern.fm/features.htmlSome features are self-explanatory (like FPS_OVERRIDE) and/or linked to a related forum thread or wiki. And some (like CONFIG_EDMAC_RAW_SLURP) are not. If such a feature is missing for a particular cam it may be because cam cannot support it at all or devs haven't found out how to make it work in a safe way. Other reasons may apply as well.
For builds like experimental "raw_video_10bit_12bit_LVState" code was copied from main build structure into another repository. This is called a
branch. And inside this branch CONFIG_EDMAC_RAW_PATCH was introduced. And for cameras not matching CONFIG_EDMAC_RAW_PATCH/CONFIG_EDMAC_RAW_SLURP there will be no 10-12-bit build at all. This may change if camera is able to support this feature and devs find out how.
You may want to take a look into
https://wiki.magiclantern.fm/glossary for other unknown terms. Some items have to be edited, though.