Fix a typo in PyUnicode_CopyCharacters() documentation.
diff --git a/Doc/c-api/unicode.rst b/Doc/c-api/unicode.rst
index abf353f..6cc8cce 100644
--- a/Doc/c-api/unicode.rst
+++ b/Doc/c-api/unicode.rst
@@ -565,7 +565,7 @@
.. c:function:: int PyUnicode_CopyCharacters(PyObject *to, Py_ssize_t to_start, \
- PyObject *to, Py_ssize_t from_start, Py_ssize_t how_many)
+ PyObject *from, Py_ssize_t from_start, Py_ssize_t how_many)
Copy characters from one Unicode object into another. This function performs
character conversion when necessary and falls back to :c:func:`memcpy` if