Update docs

Remove not needed `request` arg in order to simplify the example.

doc/en/fixture.rst

@@ -287,7 +287,7 @@ Note that we can also seamlessly use the ``yield`` syntax with ``with`` statemen
     import pytest
 
     @pytest.fixture(scope="module")
-    def smtp(request):
+    def smtp():
         with smtplib.SMTP("smtp.gmail.com") as smtp:
             yield smtp  # provide the fixture value