Update doc/en/monkeypatch.rst

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@ -46,7 +46,7 @@ environment variable is missing, or to set multiple values to a known variable.
:py:meth:`monkeypatch.setenv` and :py:meth:`monkeypatch.delenv` can be used for
these patches.
4. Use ``monkeypatch.setenv("PATH", value, prepend=":")`` to modify ``$PATH``, and
4. Use ``monkeypatch.setenv("PATH", value, prepend=os.pathsep)`` to modify ``$PATH``, and
:py:meth:`monkeypatch.chdir` to change the context of the current working directory
during a test.