docs: Update training feature/code interpreter docs (#852)

* docs: remove training docs from README

* docs: add CodeinterpreterTool to docs and update docs

* docs: fix name of tool

docs/tools/CodeInterpreterTool.md

@@ -20,6 +20,7 @@ pip install 'crewai[tools]'
 Remember that when using this tool, the code must be generated by the Agent itself. The code must be a Python3 code. And it will take some time for the first time to run because it needs to build the Docker image.
 
 ```python
+from crewai import Agent
 from crewai_tools import CodeInterpreterTool
 
 Agent(
@@ -27,3 +28,14 @@ Agent(
     tools=[CodeInterpreterTool()],
 )
 ```
+
+We also provide a simple way to use it directly from the Agent.
+
+```python
+from crewai import Agent
+
+agent = Agent(
+    ...
+    allow_code_execution=True,
+)
+```