Minor docstring / docs corrections for unittest.mock
diff --git a/Doc/library/unittest.mock-examples.rst b/Doc/library/unittest.mock-examples.rst
index d220bb3..0fc32d2 100644
--- a/Doc/library/unittest.mock-examples.rst
+++ b/Doc/library/unittest.mock-examples.rst
@@ -99,7 +99,7 @@
In the example below we have a function `some_function` that instantiates `Foo`
and calls a method on it. The call to `patch` replaces the class `Foo` with a
mock. The `Foo` instance is the result of calling the mock, so it is configured
-by modify the mock :attr:`~Mock.return_value`.
+by modifying the mock :attr:`~Mock.return_value`.
>>> def some_function():
... instance = module.Foo()