Unsupported top-level metadata `license`, `(before|after)_help`, `(before|after)_long_help`

[muzimuzhi]

• Save the first KDL code block in https://usage.jdx.dev/spec/reference/ as mycli.usage.kdl
• Replace # inline-comments with //, as proposed in docs: mark KDL code blocks as KDL and use correct inline-comment // #536
• Run

  usage lint mycli.usage.kdl

  , comment unsupported spec key, and rerun to catch them all.

mycli.usage.kdl:

min_usage_version "1.0.0" // the minimum version of usage this CLI supports
                          // you want this at the top

name "My CLI"        // a friendly name for the CLI
bin "mycli"          // the name of the binary
version "1.0.0"      // the version of the CLI
author "nobody"      // the author of the CLI
license "MIT"        // SPDX license the CLI is released under

// help for -h
before_help "before about"
about "some help"
after_help "after about"

// help for --help
before_long_help "before about"
long_about "longer help"
after_long_help "after about"

// examples (shown in markdown and manpage docs)
example "mycli --help" header="Getting help" help="Display help information"
example "mycli --version"

// render a link to the source code in markdown docs
source_code_link_template "https://github.com/me/myproj/blob/main/src/cli/{{path}}.rs"

include "./my_overrides.usage.kdl" // include another spec, will be merged and override existing values