[#175] improved javadoc for IHelpCommandInitializable

src/main/java/picocli/CommandLine.java

@@ -5783,13 +5783,14 @@ public void init(CommandLine helpCommandLine, Help.Ansi ansi, PrintStream out, P
      * before the help command's {@code run} or {@code call} method is called.</p>
      * <p><b>Implementation note:</b></p><p>
      * If an error occurs in the {@code run} or {@code call} method while processing the help request, it is recommended custom Help
-     * commands throw a {@link ParameterException} with a reference to the parent command. The {@link DefaultExceptionHandler} will print
+     * commands throw a {@link ParameterException ParameterException} with a reference to the parent command. The {@link DefaultExceptionHandler DefaultExceptionHandler} will print
      * the error message and the usage for the parent command, and will terminate with the exit code of the exception handler if one was set.
      * </p>
      * @since 3.0 */
     public static interface IHelpCommandInitializable {
         /** Initializes this object with the information needed to implement a help command that provides usage help for other commands.
-         * @param helpCommandLine provides access to this command's parent and sibling commands
+         * @param helpCommandLine the {@code CommandLine} object associated with this help command. Implementors can use
+         *                        this to walk the command hierarchy and get access to the help command's parent and sibling commands.
          * @param ansi whether to use Ansi colors or not
          * @param out the stream to print the usage help message to
          * @param err the error stream to print any diagnostic messages to, in addition to the output from the exception handler