docs: fix download & expand instruction (#12)

Author: kanarus

README.md

@@ -27,12 +27,13 @@
 
 ### Note & Tips
 
-- Example commands to download & expand MuJoCo 3.3.2:
+- For example on x86_64 Linux, run:
   ```sh
-  wget https://github.com/google-deepmind/mujoco/releases/download/3.3.2/mujoco-3.3.2-＜YOUR OPTION＞
-  tar -xzf mujoco-3.3.2-＜YOUR OPTION＞
+  wget https://github.com/google-deepmind/mujoco/releases/download/3.3.2/mujoco-3.3.2-linux-x86_64.tar.gz
+  tar -xzf mujoco-3.3.2-linux-x86_64.tar.gz
   ```
-  Replace `＜YOUR OPTION＞` depending on your system.
+  to download & expand MuJoCo 3.3.2.
+  On Windows and macOS, do similar steps with the respective archive files on your system.
 
 - One way to setup is to install MuJoCo to _a default standard path_ like `/usr/local/lib/`
   (or a folder in _PATH_ on Windows), then if needed create symlink to `mujoco-3.3.2/lib/libmujoco.so` there,