code: public CommandLine setHelpSectionMap(Map<String, IHelpSectionRenderer> map) {
          getCommandSpec().usageMessage().sectionMap(map);
          for (CommandLine command : getCommandSpec().subcommands().values()) {
              command.setHelpSectionMap(map);
          }
          return this;
      }
docs: Sets the map of section keys and renderers used to construct the usage help message.
  <p>The specified setting will be registered with this {@code CommandLine} and the full hierarchy of its
  subcommands and nested sub-subcommands <em>at the moment this method is called</em>. Subcommands added
  later will have the default setting. To ensure a setting is applied to all
  subcommands, call the setter last, after adding subcommands.</p>
  <p>Use {@link UsageMessageSpec#sectionMap(Map)} to customize a command without affecting its subcommands.</p>
  @see #getHelpSectionMap
  @since 3.9