[BUG] VS Code extension login screen: "Bedrock, Foundry, or Vertex" link uses a non-existent docs anchor (#using-third-party-providers)

Summary

On the VS Code extension's sign-in screen, the third button, Bedrock, Foundry, or Vertex, opens

https://code.claude.com/docs/en/vs-code#using-third-party-providers

That anchor does not exist on the page. The heading is ## Use third-party providers, so the anchor Mintlify generates is #use-third-party-providers. The page's own prose links to it correctly (in Prerequisites: "see [Use third-party providers](#use-third-party-providers) for setup instructions"), so only the button in the extension is out of date.

Effect: the link still loads the page, but it lands at the top instead of the setup section, so a user who clicks a button labelled "Instructions on how to use API keys on third party providers" gets no instructions in view and has to scroll the whole page to find them.

Expected

The button links to https://code.claude.com/docs/en/vs-code#use-third-party-providers and the browser jumps to the "Use third-party providers" section.

Actual

The button links to #using-third-party-providers, an anchor with no matching heading, so the browser ignores the fragment and shows the top of the page.

Steps to reproduce

1. Open the Claude Code extension in VS Code while signed out, so the "How do you want to log in?" screen is shown.
2. Click Bedrock, Foundry, or Vertex (the third button, with the external-link icon).
3. Look at the URL in the browser: it ends with #using-third-party-providers, and the page is scrolled to the top.

<img width="582" height="633" alt="Image" src="https://github.com/user-attachments/assets/74286da6-6ad0-4890-ac17-42b91bbd87c5" />

Environment

• Claude Code 2.1.246
• VS Code extension, Windows 11 Pro (10.0.26200)

Suggested fix

Change the URL behind that button from #using-third-party-providers to #use-third-party-providers. Alternatively, add a redirect/alias anchor on the docs page if the old fragment is linked from elsewhere too.