Where do people find Neutron Options in Devstack with their how-to use documents

Hello,

 I am very curious where they find Neutron Options in Devstack local.conf file, and how do they know to use which option is correct,  is there any document with detailed description of all Devstack Neutron Options on Internet? I try to find these information, but they are all likely general descriptions.
some Options in local.conf file such as FORCE_CONFIG_DRIVE, Q_USE_ROOTWRAP, Q_USE_PROVIDERNET_FOR_PUBLIC .... (I got from other people, but I don't know how they find these options and how do them know to use them. I searched stackrc code, but I did not find some of theses options either)
Some of Devstack Options of local.conf file seem like scattered in the Internet with little information (some not even documented in Devstack Official web). Is there any better way to find these Devstack Neutron Options of local.conf file.


Thanks a lot.

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