[7.4.x] doc: Link pytest.main to how-to guide (#11290)

Co-authored-by: Florian Bruhin <[email protected]>

Author: github-actions[bot]

doc/en/reference/reference.rst

@@ -82,6 +82,8 @@ pytest.exit
 pytest.main
 ~~~~~~~~~~~
 
+**Tutorial**: :ref:`pytest.main-usage`
+
 .. autofunction:: pytest.main
 
 pytest.param