Align with the docstring defined in the C implementation:

"Raised when a COM method call failed."

https://github.com/python/cpython/blob/2313f8421080ceb3343c6f5d291279adea85e073/Modules/_ctypes/_ctypes.c#L5548

Author: junkmd

Doc/library/ctypes.rst

@@ -1810,7 +1810,7 @@ different ways, depending on the type and number of the parameters in the call:
 .. exception:: COMError(hresult, text, details)
 
    Windows only: This non-public exception is raised when a COM method call
-   fails.
+   failed.
 
    .. attribute:: hresult