update changelog

Author: github-actions[bot]

docs/changelog/changelog.mdx

@@ -4,6 +4,12 @@ icon: "clock"
 iconType: "solid"
 ---
 
+<Update label="v0.51.0" description="March 13, 2025">
+### [Introduces Pink in codegen with updated API docs.](https://github.com/codegen-sh/codegen-sdk/releases/tag/v0.51.0)
+- Updated API reference documentation
+- Implemented Pink in code generation
+</Update>
+
 <Update label="v0.50.2" description="March 13, 2025">
 ### [Fixes draft setting for private repositories.](https://github.com/codegen-sh/codegen-sdk/releases/tag/v0.50.2)
 - Fix issue with draft setting for private repositories