Update index.md (#8740)

Added link to March blog

Author: hector-norza

releases/2025-03/index.md

@@ -11,9 +11,7 @@ You can find links to packages, code, and docs on our [Azure SDK Releases page](
 
 ## Release Highlights
 
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+Welcome to the March release of the Azure SDK. Read more on our [March Release Blog](https://devblogs.microsoft.com/azure-sdk/azure-sdk-release-march-2025/).
 
 ## Release Notes