MFC r339524 (by imp):

Add missing options.

WITHOUT_LOADER_LUA is only needed since we turned it off by default on
powerpc and sparc64 in r338203. Same with
WITHOUT_LOADER_GEIL. WITH_NVME, WITHOUT_NVME, WITH_LOADER_FORCE_LE
have been needed since they were added.

MFC r353737:

Provide a src.conf(5) description for the new WITHOUT_CAROOT option, and
rename the WITH_LOADER_VERIEXEC_PASS_MANFIEST description to its correct
name. Also correct a bunch of spelling errors in that description.