fix typo in comment (#10)

Author: pmeier

pytest_pytorch/plugin.py

@@ -26,7 +26,7 @@ def from_parent(cls, parent, *, name, obj=None):
 
     def collect(self):
         # Yes, this is a bad practice. Unfortunately, there is no other option to
-        # inject our custom 'TestCaseFunction' without duplicating everyting in
+        # inject our custom 'TestCaseFunction' without duplicating everything in
         # 'UnitTestCase.collect()'
         with unittest.mock.patch(
             "_pytest.unittest.TestCaseFunction", new=PyTorchTestCaseFunction