fix: streaming guide link on running-agents page

[Sachin-chaurasiya]

This PR fixes the "Streaming guide" link on Running-agents page.

Recording of the issue

Screen.Recording.2025-06-07.at.4.34.30.PM.mov

Previous Link: /guides/streaming
Updated Link: /openai-agents-js/guides/streaming

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Latest commit: 233f56b

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[Sachin-chaurasiya]

Hi @dkundel-openai, could you please review this? Thank you.