Update url in warning (#490)

This was missed in #383

Author: MatthijsBurgh

src/pytest_mock/plugin.py

@@ -264,7 +264,7 @@ def _start_patch(
                         "Mocks returned by pytest-mock do not need to be used as context managers. "
                         "The mocker fixture automatically undoes mocking at the end of a test. "
                         "This warning can be ignored if it was triggered by mocking a context manager. "
-                        "https://pytest-mock.readthedocs.io/en/latest/remarks.html#usage-as-context-manager",
+                        "https://pytest-mock.readthedocs.io/en/latest/usage.html#usage-as-context-manager",
                         PytestMockWarning,
                         stacklevel=5,
                     )

tests/test_pytest_mock.py

@@ -997,7 +997,7 @@ def doIt(self):
         "Mocks returned by pytest-mock do not need to be used as context managers. "
         "The mocker fixture automatically undoes mocking at the end of a test. "
         "This warning can be ignored if it was triggered by mocking a context manager. "
-        "https://pytest-mock.readthedocs.io/en/latest/remarks.html#usage-as-context-manager"
+        "https://pytest-mock.readthedocs.io/en/latest/usage.html#usage-as-context-manager"
     )
 
     with pytest.warns(
@@ -1014,7 +1014,7 @@ def test_warn_patch_context_manager(mocker: MockerFixture) -> None:
         "Mocks returned by pytest-mock do not need to be used as context managers. "
         "The mocker fixture automatically undoes mocking at the end of a test. "
         "This warning can be ignored if it was triggered by mocking a context manager. "
-        "https://pytest-mock.readthedocs.io/en/latest/remarks.html#usage-as-context-manager"
+        "https://pytest-mock.readthedocs.io/en/latest/usage.html#usage-as-context-manager"
     )
 
     with pytest.warns(