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e7db5584 - [libc][docs] Add spawn.h POSIX header documentation (#186291)

[libc][docs] Add spawn.h POSIX header documentation (#186291) Add YAML metadata for `spawn.h` listing all POSIX-mandated macros (`POSIX_SPAWN_RESETIDS`, `POSIX_SPAWN_SETPGROUP`, `POSIX_SPAWN_SETSCHEDPARAM`, `POSIX_SPAWN_SETSCHEDULER`, `POSIX_SPAWN_SETSID`, `POSIX_SPAWN_SETSIGDEF`, `POSIX_SPAWN_SETSIGMASK`) and all 23 functions (`posix_spawn`, `posix_spawnp`, `posix_spawn_file_actions_*`, `posix_spawnattr_*`). Add `spawn` to `index.rst` and `CMakeLists.txt` `docgen_list`. Verified with `python3 docgen.py spawn.h` — generates valid RST with correct POSIX links. Partial fix for #122006