add documented hookimpl_opts and hookspec_opts decorators

so that one doesn't have to use pytest.mark or function-attribute setting anymore

--HG--
branch : more_plugin

testing/python/collect.py

@@ -563,7 +563,7 @@ class TestConftestCustomization:
         b = testdir.mkdir("a").mkdir("b")
         b.join("conftest.py").write(py.code.Source("""
             import pytest
-            @pytest.mark.hookwrapper
+            @pytest.hookimpl_opts(hookwrapper=True)
             def pytest_pycollect_makeitem():
                 outcome = yield
                 if outcome.excinfo is None: