function mdPluginToken (md) {
  const defaultRender = md.renderer.rules.code_inline

  md.renderer.rules.code_inline = (tokens, idx, options, env, self) => {
    const token = tokens[ idx ]

    token.attrSet('class', 'doc-token')
    return defaultRender(tokens, idx, options, env, self)
  }
}
Adds class 'doc-token' to inline code