Use exc role for ValueError in multiprocessing.rst
diff --git a/Doc/library/multiprocessing.rst b/Doc/library/multiprocessing.rst
index 216a092..d20098f 100644
--- a/Doc/library/multiprocessing.rst
+++ b/Doc/library/multiprocessing.rst
@@ -1010,7 +1010,7 @@
using :meth:`recv`.
The object must be picklable. Very large pickles (approximately 32 MB+,
- though it depends on the OS) may raise a ValueError exception.
+ though it depends on the OS) may raise a :exc:`ValueError` exception.
.. method:: recv()