fix comment typos

_pytest/pytester.py

@@ -467,9 +467,9 @@ class TmpTestdir:
 
     def _getpybinargs(self, scriptname):
         if not self.request.config.getvalue("notoolsonpath"):
-            # XXX we rely on script refering to the correct environment
+            # XXX we rely on script referring to the correct environment
             # we cannot use "(py.std.sys.executable,script)"
-            # becaue on windows the script is e.g. a py.test.exe
+            # because on windows the script is e.g. a py.test.exe
             return (py.std.sys.executable, _pytest_fullpath,) # noqa
         else:
             pytest.skip("cannot run %r with --no-tools-on-path" % scriptname)

_pytest/python.py

@@ -485,7 +485,7 @@ class Module(pytest.File, PyCollector):
             fin = getattr(self.obj, 'teardown_module', None)
         if fin is not None:
             #XXX: nose compat hack, move to nose plugin
-            # if it takes a positional arg, its probably a pytest style one
+            # if it takes a positional arg, it's probably a pytest style one
             # so we pass the current module object
             if inspect.getargspec(fin)[0]:
                 finalizer = lambda: fin(self.obj)