Add DeepSeek as supported model intro-to-ai-monitoring.mdx

[shwartzm-NR]

Adding DeepSeek as supported model

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[WriteMayur]

@shwartzm-NR, Please signed CLA for the PR else we won't be able to merge the PR.

[shwartzm-NR]

Signed the CLA

[WriteMayur]

LGTM