feat: add snippet about disabling optimizer

Author: Ph0enixKM

docs/0.5.1-alpha/getting_started/usage.md

@@ -162,3 +162,11 @@ $ cat ~/.bashrc
 source <(amber completion)
 ...
 ```
+
+### Disabling the Optimizer
+
+The optimizer is still being improved. If you encounter any issues with optimization, you can disable it using an environment variable:
+
+```sh
+AMBER_NO_OPTIMIZE=1 amber ...
+```

docs/0.5.1-alpha/getting_started/whats_new.md

@@ -75,7 +75,11 @@ my_array=(1 2 3)
 echo "${my_array[@]}"
 ```
 
-For now, this optimizer works for simple expressions, but it will be improved as we continue to develop Amber.
+For now, this optimizer works for simple expressions, but it will be improved as we continue to develop Amber. It's still an alpha version, so if you suspect that it works incorrectly, you can disable it with an environment variable:
+
+```sh
+AMBER_NO_OPTIMIZE=1 amber ...
+```
 
 # Reversed range support <!-- #753 -->
 

docs/0.6.0-alpha/getting_started/usage.md

@@ -162,3 +162,11 @@ $ cat ~/.bashrc
 source <(amber completion)
 ...
 ```
+
+### Disabling the Optimizer
+
+The optimizer is still being improved. If you encounter any issues with optimization, you can disable it using an environment variable:
+
+```sh
+AMBER_NO_OPTIMIZE=1 amber ...
+```