docs: fix a repo param on codespaces url

[JamBalaya56562]

Summary:

Documentation:

• Fix the repo parameter in the Codespaces URL in README.md to reference github/docs

What's being changed (if available, include any code snippets, screenshots, or gifs):

Before	After
https://github.com/codespaces/new/?repo=github	https://github.com/codespaces/new/?repo=github/docs

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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[Sharra-writes]

@JamBalaya56562 I really need to prioritize changing the readme. The reason the link points to github and not docs is because the README.md is meant for internal use, and people at GitHub may need spin up a codespace on any one of our internal repositories. It's why we have a separate contributing doc that we link open source contributors to. Because docs syncs with docs-internal, all the files have to be exactly the same, even those we keep in docs-internal for internal use.

I need to make it clearer the readme is for internal use, I just haven't been prioritizing it, but you're the third person in 2 weeks who has wanted to fix it to make it better for open source contributors. 😅 I'm going to close this PR, but thank you for opening it. 💛 That file is legitimately confusing and needs to be fixed, just not in this way.