Update docs for R2 Account level and User level API tokens

[smellercf]

Summary

Updates docs to reflect the new UI for creating R2 API tokens. The updated flow allows users to view and create both account level and user level tokens from the same page.

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Updated documentation to reflect the new user interface for creating R2 API tokens, allowing users to manage both account level and user level tokens from a single page.

• Revised the API token creation flow to include both account level and user level tokens.
• Updated permissions and management instructions for API tokens.
• Removed outdated steps and added new UI elements for clarity.

Renamed Files

• src/content/docs/r2/api/tokens.mdx

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[rahulsuresh-cf]

Thank you, all!