Split code block up in docs to avoid pygments/pygments#2226 in 2.15.0

Author: CAM-Gerlach

Doc/library/multiprocessing.rst

@@ -452,7 +452,7 @@ process which created it.
    importable by the children. This is covered in :ref:`multiprocessing-programming`
    however it is worth pointing out here. This means that some examples, such
    as the :class:`multiprocessing.pool.Pool` examples will not work in the
-   interactive interpreter. For example::
+   interactive interpreter. For example, this::
 
       >>> from multiprocessing import Pool
       >>> p = Pool(5)
@@ -461,6 +461,11 @@ process which created it.
       ...
       >>> with p:
       ...     p.map(f, [1,2,3])
+
+   Will result in:
+
+   .. code-block:: text
+
       Process PoolWorker-1:
       Process PoolWorker-2:
       Process PoolWorker-3: