The zither syscall documentation backend is responsible for generating the official syscall documentation markdown found at //docs/reference/syscalls.
TODO(https://fxbug.dev/42061412): Once we have a first-class representation of syscalls in FIDL, this backend should be retired in favour of fidldoc support.
A ${syscall_name}.md page is generated per syscall, as well as syscall_docs.gni containing a GN list, syscall_docs, of all such pages.
${fidl_target}_zither.syscall_docs generates these files, which are intended to be accessed via zither_golden_files() in order to be checked in as source. The contents of the generated syscall_docs.gni in turn informs the generation logic of all expected outputs.
Any declaration type not mentioned below is ignored.
Each syscall declaration yields one documentation page and one entry in syscall_docs.