bpo-41802: Document 'PyDict_DelItem' can raise a 'KeyError' (pythonGH-22291)

(cherry picked from commit 20ce62f)

Co-authored-by: Campbell Barton <[email protected]>

Author: 2 people

Doc/c-api/dict.rst

@@ -81,14 +81,16 @@ Dictionary Objects
 .. c:function:: int PyDict_DelItem(PyObject *p, PyObject *key)
 
    Remove the entry in dictionary *p* with key *key*. *key* must be hashable;
-   if it isn't, :exc:`TypeError` is raised.  Return ``0`` on success or ``-1``
-   on failure.
+   if it isn't, :exc:`TypeError` is raised.
+   If *key* is not in the dictionary, :exc:`KeyError` is raised.
+   Return ``0`` on success or ``-1`` on failure.
 
 
 .. c:function:: int PyDict_DelItemString(PyObject *p, const char *key)
 
-   Remove the entry in dictionary *p* which has a key specified by the string
-   *key*.  Return ``0`` on success or ``-1`` on failure.
+   Remove the entry in dictionary *p* which has a key specified by the string *key*.
+   If *key* is not in the dictionary, :exc:`KeyError` is raised.
+   Return ``0`` on success or ``-1`` on failure.
 
 
 .. c:function:: PyObject* PyDict_GetItem(PyObject *p, PyObject *key)