Add explanation of use_native_tools

docs/griptape-framework/tools/index.md

@@ -1,7 +1,10 @@
 ## Overview
 
 One of the most powerful features of Griptape is the ability to use tools that can interact with the outside world.
-Many of our [Prompt Drivers](../drivers/prompt-drivers.md) leverage the native function calling built into the LLMs. For LLMs that don't support this, Griptape provides its own implementation using the [ReAct](https://arxiv.org/abs/2210.03629) technique.
+Many of our [Prompt Drivers](../drivers/prompt-drivers.md) leverage the native function calling built into the LLMs. 
+For LLMs that don't support this, Griptape provides its own implementation using the [ReAct](https://arxiv.org/abs/2210.03629) technique. 
+
+You can switch between the two strategies by setting `use_native_tools` to `True` (LLM-native tool calling) or `False` (Griptape tool calling) on your [Prompt Driver][../drivers/prompt-drivers.md].
 
 ## Tools
 Here is an example of a Pipeline using Tools: