docs: v3.3.1 changelog

Author: kozistr

docs/changelogs/v3.3.1.md

@@ -8,7 +8,8 @@
     * [SGD-like Memory, AdamW-level Performance](https://arxiv.org/abs/2412.05270) 
 * Rename the `Apollo` (`An Adaptive Parameter-wise Diagonal Quasi-Newton Method for Nonconvex Stochastic Optimization`) optimizer name to `ApolloDQN` not to overlap with the new optimizer name `APOLLO`. (#312)
 * Implement `MARS` optimizer. (#313, #314)
-    * [Unleashing the Power of Variance Reduction for Training Large Models](https://arxiv.org/abs/2411.10438) 
+    * [Unleashing the Power of Variance Reduction for Training Large Models](https://arxiv.org/abs/2411.10438)
+* Support `Cautious` variant to `MARS` optimizer. (#314)
 
 ### Bug
 
@@ -17,7 +18,7 @@
 
 ### Docs
 
-* Add more visualizations. (#310)
+* Add more visualizations. (#310, #314)
 
 ### Contributions