docs: v3.1.1 changelog

Author: kozistr

docs/changelogs/v3.1.1.md

@@ -10,4 +10,5 @@
 
 ### Bug
 
-* Fix to handle the optimizers that only take the `model` instead of the parameters in `create_optimizer()`. (#263)
+* Handle the optimizers that only take the `model` instead of the parameters in `create_optimizer()`. (#263)
+* Move the variable to the same device with the parameter. (#266, #267)