docs: update custom-whitelisted-dependencies.mdx (#1366)

The module example is too abstract. Giving an example of a known library would be beneficial for users to understand

docs/custom-whitelisted-dependencies.mdx

@@ -7,7 +7,7 @@ By default, PandasAI only allows to run code that uses some whitelisted modules.
 ```python
 from pandasai import SmartDataframe
 df = SmartDataframe("data.csv", config={
-    "custom_whitelisted_dependencies": ["any_module"]
+    "custom_whitelisted_dependencies": ["seaborn"]
 })
 ```