📝 Update HTTPException details in `docs/en/docs/tutorial/handling-e…

…rrors.md` (#5418)

Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>

docs/en/docs/tutorial/handling-errors.md

@@ -234,9 +234,7 @@ You will receive a response telling you that the data is invalid containing the
 
 And **FastAPI**'s `HTTPException` error class inherits from Starlette's `HTTPException` error class.
 
-The only difference, is that **FastAPI**'s `HTTPException` allows you to add headers to be included in the response.
-
-This is needed/used internally for OAuth 2.0 and some security utilities.
+The only difference is that **FastAPI**'s `HTTPException` accepts any JSON-able data for the `detail` field, while Starlette's `HTTPException` only accepts strings for it.
 
 So, you can keep raising **FastAPI**'s `HTTPException` as normally in your code.