Markdown templates not compatible with MDX v3

[coopernetes]

Hi,
I'm using this project to generate MDX files from our schema to feed into a Docusaurus static web site for documentation. It seems the md_nested template generates non-compliant Markdown with MDX due to mixing inline and newline styles.

Here's a snippet that's generated and where the mdx compiler gets upset:

<details>
<summary><strong> <a name="authorisedList"></a>1. [Optional] Property Git Proxy configuration file > authorisedList</strong>

</summary>

Error: MDX compilation failed for file "/home/tom/repos/git-proxy/website/docs/configuration/reference.mdx"
Cause: Expected a closing tag for `</strong>` (19:1-19:10) before the end of `paragraph`
Details:
{
  "column": 1,
  "message": "Expected a closing tag for `</strong>` (19:1-19:10) before the end of `paragraph`",
  "line": 19,
  "name": "19:1-19:125",
  "place": {
    "start": {
      "line": 19,
      "column": 1,
      "offset": 678,
      "_index": 0,
      "_bufferIndex": 0
    },
    "end": {
      "line": 19,
      "column": 125,
      "offset": 802,
      "_index": 1,
      "_bufferIndex": -1
    }
  },
  "reason": "Expected a closing tag for `</strong>` (19:1-19:10) before the end of `paragraph`",
  "ruleId": "end-tag-mismatch",
  "source": "mdast-util-mdx-jsx"
}

This isn't really a specific issue with JSFH. A new MDX compatible template could work to resolve this. For now, I'm doing a simple regex replace in my string to strip the leading two newlines in the md_nested template:

const schemaDoc = readFileSync(`${tempdir}${sep}schema.md`, 'utf-8')
    .replace(/\n\n<\/summary>/g, '</summary>'); // https://github.com/orgs/mdx-js/discussions/2260
const docString = `---
title: Schema Reference
description: JSON schema reference documentation for Git Proxy
---
  
${schemaDoc}
`;

[dblanchette]

I fixed the missing line feed after <summary>. Thanks for the report!