bpo-35044, doc: Use the :exc: role for the exceptions (GH-10037)

(cherry picked from commit e483f02423917dc4dfd25f46e5b9e6fce304777d)

Co-authored-by: Stéphane Wirtel <stephane@wirtel.be>
diff --git a/Doc/faq/extending.rst b/Doc/faq/extending.rst
index fd04a83..b611bb4 100644
--- a/Doc/faq/extending.rst
+++ b/Doc/faq/extending.rst
@@ -63,7 +63,7 @@
 The highest-level function to do this is :c:func:`PyRun_SimpleString` which takes
 a single string argument to be executed in the context of the module
 ``__main__`` and returns ``0`` for success and ``-1`` when an exception occurred
-(including ``SyntaxError``).  If you want more control, use
+(including :exc:`SyntaxError`).  If you want more control, use
 :c:func:`PyRun_String`; see the source for :c:func:`PyRun_SimpleString` in
 ``Python/pythonrun.c``.