Fixed an incorrect sentence in the docs (GH-17205)


Fixed an incorrect sentence in Doc/c-api/mapping.rst I fell on
while translating the file.

skip issue

Automerge-Triggered-By: @csabella
(cherry picked from commit 06ca2a2be9374ac390e9407685ccce941ab9ffa2)

Co-authored-by: Aveheuzed <a.masson555@ntymail.com>
diff --git a/Doc/c-api/mapping.rst b/Doc/c-api/mapping.rst
index 4015f43..6a80b03 100644
--- a/Doc/c-api/mapping.rst
+++ b/Doc/c-api/mapping.rst
@@ -14,8 +14,7 @@
    Return ``1`` if the object provides mapping protocol or supports slicing,
    and ``0`` otherwise.  Note that it returns ``1`` for Python classes with
    a :meth:`__getitem__` method since in general case it is impossible to
-   determine what the type of keys it supports.  This function always
-   succeeds.
+   determine what type of keys it supports. This function always succeeds.
 
 
 .. c:function:: Py_ssize_t PyMapping_Size(PyObject *o)