docs: v3.5.2 changelog

Author: kozistr

docs/changelogs/v3.5.2.md

@@ -4,6 +4,8 @@
 
 * Implement `Fira` optimizer. (#376)
     * [Can We Achieve Full-rank Training of LLMs Under Low-rank Constraint?](https://arxiv.org/abs/2410.01623) 
+* Implement `RACS` and `Alice optimizer. (#376)
+    * [Towards Efficient Optimizer Design for LLM via Structured Fisher Approximation with a Low-Rank Extension](https://arxiv.org/abs/2502.07752)
 
 ### Fix