update rsl_rl to v2.2.0

Author: BigJohnn

sim/genesis/README.md

@@ -4,7 +4,7 @@
 # 安装rsl_rl。
 ```
 git clone https://github.com/leggedrobotics/rsl_rl
-cd rsl_rl && git checkout v2.0.1 && pip install -e .
+cd rsl_rl && git checkout v2.2.0 && pip install -e .
 ```
 
 # 安装tensorboard。

sim/genesis/README_EN.md

@@ -10,7 +10,7 @@ cd sim/genesis
 ### Install rsl_rl
 ```bash
 git clone https://github.com/leggedrobotics/rsl_rl
-cd rsl_rl && git checkout v2.0.1 && pip install -e .
+cd rsl_rl && git checkout v2.2.0 && pip install -e .
 ```
 
 ### Install TensorBoard