create markdown docs for fx subcommands
usage: fx helpdoc [OPTIONS] OUTPUT_DIR Create markdown documentation for fx and its subcommands, based on the same metadata that is used to create the output of `fx help` --vendor create docs for subcommands in //vendor/*/scripts/devshell. If specified, only vendor docs are documented. There's no way to generate docs for vendor and non-vendor at the same time. --toc-prefix URL_PREFIX use URL_PREFIX instead of "/reference/tools/fx" as an URL prefix in generated _toc.yaml files. --escape-jinja escape jinja tags in fx help text to avoid parsing errors in fuchsia.dev. --no-deprecated do not create docs for deprecated subcommands --no-contrib do not create docs for contrib scripts in //tools/devshell/contrib/*