Additional custom help text

How can I prepend/append custom (**bold**) text to the default one (*italics*)?
**Example**:
>>*MyTool 1.0.0.0
Copyright © My Company*
**... prepend any custom text here ...**
*--path Required. Path to file.
--major Required. Major version number. Must be int or {Function}.
--minor Required. Minor version number. Must be int or {Function}.
--build Required. Build version number. Must be int or {Function}.
--revision Required. Revision version number. Must be int or {Function}.
--logLevel (Default: Info) Info = silent, Debug = verbose.
--help Display this help screen.
--version Display version information.*
**... append any custom text here ...**

Issue 中未指出檔案、測試或進入點；首先定位命令列說明的產生邏輯及其現有的預設文字。完成標準是呼叫端可以在前後加入自訂粗體文字，同時保留預設的說明輸出和格式。

由索引模型根據 Issue 內容生成。