Add changelog for January 21, 2025 (#161)

Author: quantstruct-bot

fern/changelog/2025-01-21.mdx

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+# Updated Azure Regions for Credentials
+
+1. **Updated Azure Regions for Credentials**: You can now specify `canadacentral`, `japaneast`, and `japanwest` as valid regions when specifying your Azure credentials. Additionally, the region `canada` has been renamed to `canadaeast`, and `japan` has been replaced with `japaneast` and `japanwest`; please update your configurations accordingly.
+
+<Frame caption="Updated Azure Regions for Credentials">
+    <img src="../static/images/changelog/azure-openai-credentials.png" />
+</Frame>