improvement(api-markdown-documenter): Simplify empty table cell rendering in Markdown

[Josmithr]

Optimizes rendering of empty table cells in Markdown to omit only a single space instead of two.

The primary goal of this PR is to align our Markdown rendering with the behavior of mdast-util-to-markdown, which we plan to use to replace our custom Markdown rendering.

[Copilot]

Pull Request Overview

This PR updates the Markdown table row renderer to output a single space for empty cells, matching mdast-util-to-markdown behavior.

• Simplifies empty cell output by writing only a pipe and minimal spaces.
• Adjusts spacing logic to omit the extra space after empty cells.

Comments suppressed due to low confidence (1)

tools/api-markdown-documenter/src/renderers/markdown-renderer/default-renderers/RenderTableRow.ts:28

• Add or update unit tests to cover rendering of empty table cells, ensuring the new single-space behavior matches mdast-util-to-markdown exactly.

if (child.isEmpty) {

[github-actions]

🔗 No broken links found! ✅

Your attention to detail is admirable.

linkcheck output

> fluid-framework-docs-site@0.0.0 ci:check-links /home/runner/work/FluidFramework/FluidFramework/docs
> start-server-and-test "npm run serve -- --no-open" 3000 check-links

1: starting server using command "npm run serve -- --no-open"
and when url "[ 'http://127.0.0.1:3000' ]" is responding with HTTP status code 200
running tests using command "npm run check-links"


> fluid-framework-docs-site@0.0.0 serve
> docusaurus serve --no-open

[SUCCESS] Serving "build" directory at: http://localhost:3000/

> fluid-framework-docs-site@0.0.0 check-links
> linkcheck http://localhost:3000 --skip-file skipped-urls.txt

Crawling...

Stats:
  222981 links
    1707 destination URLs
    1939 URLs ignored
       0 warnings
       0 errors