fix instances of consecutive articles (closes #23221)

Patch by Karan Goel.
diff --git a/Doc/c-api/exceptions.rst b/Doc/c-api/exceptions.rst
index 8ad742a..66b7752 100644
--- a/Doc/c-api/exceptions.rst
+++ b/Doc/c-api/exceptions.rst
@@ -64,7 +64,7 @@
       Do not compare the return value to a specific exception; use
       :c:func:`PyErr_ExceptionMatches` instead, shown below.  (The comparison could
       easily fail since the exception may be an instance instead of a class, in the
-      case of a class exception, or it may the a subclass of the expected exception.)
+      case of a class exception, or it may be a subclass of the expected exception.)
 
 
 .. c:function:: int PyErr_ExceptionMatches(PyObject *exc)