Updated subworkflows.py (flyteorg#679)

Fixed left pane to show main-headings only (instead of sub-headings of subworkflows.py)
Signed-off-by: SmritiSatyanV <[email protected]>

cookbook/core/control_flow/subworkflows.py

@@ -27,7 +27,7 @@
 
 # %%
 # Example
-# --------
+# ^^^^^^^^
 # We import the required dependencies into the environment.
 import typing
 from typing import Tuple
@@ -91,7 +91,7 @@ def nested_parent_wf(a: int) -> Tuple[int, str, str, str]:
 
 # %%
 # External Workflow
-# ------------------
+# ^^^^^^^^^^^^^^^^^^
 #
 # When launch plans are used within a workflow to launch the execution of a previously defined workflow, a new
 # external execution is launched, with a separate execution ID and can be observed as a distinct entity in