Revert "ChatGPT helping me on the docs"

This reverts commit d2b0460.

Author: Kludex

instrumentation/opentelemetry-instrumentation-tornado/src/opentelemetry/instrumentation/tornado/__init__.py

@@ -121,10 +121,7 @@ def client_response_hook(span, future):
 The value of the attribute will be single item list containing all the header values.
 
 Example of the added span attribute,
-
-.. code-block:: none
-
-    http.request.header.custom-request-header = ["<value1>,<value2>"]
+``http.request.header.custom-request-header = ["<value1>,<value2>"]``
 
 Response headers
 ****************
@@ -146,10 +143,7 @@ def client_response_hook(span, future):
 The value of the attribute will be single item list containing all the header values.
 
 Example of the added span attribute,
-
-.. code-block:: none
-
-    http.response.header.custom-response-header = ["<value1>,<value2>"]
+``http.response.header.custom-response-header = ["<value1>,<value2>"]``
 
 Note:
     Environment variable names to capture http headers are still experimental, and thus are subject to change.