Update overview-key-scenarios.md: move Public Preview notice to a highlighted note for better visibility

Author: Mukesh Dua

articles/microsoft-discovery/overview-key-scenarios.md

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-*Microsoft Discovery is currently in Public Preview. Features, capabilities, and availability are subject to change and results may vary* 
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 # Key Scenarios & Use Cases for Scientific R&D
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+> [!NOTE]
+> Microsoft Discovery is currently in Public Preview. Features, capabilities, and availability are subject to change and results may vary.
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 Microsoft Discovery is an **AI-powered platform for scientific research and engineering**, designed to accelerate discovery across pharmaceuticals, materials science, chemicals, semiconductors, energy, and advanced manufacturing. The platform supports the full research lifecycle—from understanding existing knowledge to designing, testing, and refining new ideas. 
 
 Below are the **core scenarios customers can expect to use with Microsoft Discovery today and over time**.