docs: for pull #2330, fixed 1 outdated doc(s)

[joggrbot]

✨ Autofixed 1 outdated doc(s)

This pull was automatically generated by Joggr to fix 1 outdated doc(s) due to code changes in pull #2330

Fixed docs

The following docs were fixed:

• website/docs/user-guide/getting-started/Getting-Started.mdx: The documentation only referenced OpenAI provider setup and omitted any mention of the newly released Anthropic V2 Client and its usage, despite these being prominent in recent code changes and docs/notebooks. I fixed this by adding installation, setup, and usage examples for Anthropic V2, updating provider-related sections, and guiding users toward richer multi-provider support throughout AG2.

How to fix

To fix the docs, you can either:

1. Merge this pull request into your pull request to fix the docs
2. Wait for your pull request to be merged and then merge this pull request into your base branch

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[priyansh4320]

closing this documentation pull as wrong and not required.