[api-documenter] Add a setting to remove the "do not edit" comment from the generated markdown

[niming175]

Summary

在生产的md文档中，在每个文件的顶部都会有这么一句：

<!-- Do not edit this file. It is automatically generated by API Documenter. -->

这个在使用docusaurus部署我的文档会有影响。
所以，我想去掉这个注释，我该如何做？

In the generated Markdown (.md) documents, there is a line at the top of each file:

<!-- Do not edit this file. It is automatically generated by API Documenter. -->

This causes issues when deploying my documentation using Docusaurus.
So, I want to remove this comment. How can I do that?

Repro steps

Expected result:

Actual result:

Details

Standard questions

Please answer these questions to help us investigate your issue more quickly:

Question	Answer
@microsoft/api-documenter version?	7.26.3
Operating system?	Linux
Documentation target?	Markdown
Would you consider contributing a PR?	No
TypeScript compiler version?	5.7.2
Node.js version (node -v)?	20.14.0

[octogonz]

This is a good suggestion.

However, for Docusaurus specifically, the <!-- --> tag should not be a problem. Here is an example from our own docs which use Docusaurus:

websites/api.rushstack.io/docs/pages/api-documenter.iapidocumenterpluginmanifest.features.md

---
hide_title: true
custom_edit_url: null
pagination_prev: null
pagination_next: null
---
<!-- Do not edit this file. It is automatically generated by API Documenter. -->

[Home](./index.md) &gt; [@microsoft/api-documenter](./api-documenter.md) &gt; [IApiDocumenterPluginManifest](./api-documenter.iapidocumenterpluginmanifest.md) &gt; [features](./api-documenter.iapidocumenterpluginmanifest.features.md)

## IApiDocumenterPluginManifest.features property

The list of features provided by this plugin.

**Signature:**

```typescript
features: IFeatureDefinition[];
```

The purpose of the comment is to prevent people from accidentally modifying these machine-generated files.

[octogonz]

Here's a design proposal: #5178