Doc/c-api/exceptions.rst: fix grammar (#12091)

* Doc/c-api/exceptions.rst: fix grammar

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* Use ", in that case"
Co-Authored-By: blueyed <github@thequod.de>

Doc/c-api/exceptions.rst

@@ -53,8 +53,8 @@ Printing and clearing
 .. c:function:: void PyErr_PrintEx(int set_sys_last_vars)
 
    Print a standard traceback to ``sys.stderr`` and clear the error indicator.
-   **Unless** the error is a ``SystemExit``.  In that case the no traceback
-   is printed and Python process will exit with the error code specified by
+   **Unless** the error is a ``SystemExit``, in that case no traceback is
+   printed and the Python process will exit with the error code specified by
    the ``SystemExit`` instance.
 
    Call this function **only** when the error indicator is set.  Otherwise it