bpo-31304: Update starmap_async documentation. (GH-4168) (GH-4177)

Update the kwarg in the documentation of `multiprocessing.pool.Pool.starmap_async`, from `error_back` to `error_callback` to match the source code.
(cherry picked from commit 11225753a89c2907bb717e6c050fe907e5e11829)

diff --git a/Doc/library/multiprocessing.rst b/Doc/library/multiprocessing.rst
index 2f770b6322309e77a15f66396146375c760699e0..2a52af1c8972193e2a1b537fd14093a8008d7b4c 100644 (file)
--- a/Doc/library/multiprocessing.rst
+++ b/Doc/library/multiprocessing.rst
@@ -2165,7 +2165,7 @@ with the :class:`Pool` class.
 
       .. versionadded:: 3.3
 
-   .. method:: starmap_async(func, iterable[, chunksize[, callback[, error_back]]])
+   .. method:: starmap_async(func, iterable[, chunksize[, callback[, error_callback]]])
 
       A combination of :meth:`starmap` and :meth:`map_async` that iterates over
       *iterable* of iterables and calls *func* with the iterables unpacked.