Update overview.md

site/en/about/overview.md

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 summary: Milvus is a high-performance, highly scalable vector database that runs efficiently across a wide range of environments, from a laptop to large-scale distributed systems. It is available as both open-source software and a cloud service.
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+# What is Milvus?
+
 Milvus is a high-performance, highly scalable vector database that runs efficiently across a wide range of environments, from a laptop to large-scale distributed systems. It is available as both open-source software and a cloud service.
 
 Milvus is an open-source project under LF AI & Data Foundation distributed under the Apache 2.0 license. Most contributors are experts from the high-performance computing (HPC) community, specializing in building large-scale systems and optimizing hardware-aware code. Core contributors include professionals from Zilliz, ARM, NVIDIA, AMD, Intel, Meta, IBM, Salesforce, Alibaba, and Microsoft.