Update doc for starmap_async error

Update doc for starmap_async error_back kwarg

BPO	31304
Nosy	@Mariatta
PRs	bpo-31304: Corrected typo in the documentation of multiprocessing.pool.Pool.starmap #4168 [3.6] bpo-31304: Update starmap_async documentation. (GH-4168) #4177

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

Show more details

GitHub fields:

assignee = None
closed_at = <Date 2017-10-30.18:48:42.792>
created_at = <Date 2017-08-29.20:13:31.257>
labels = ['easy', 'type-bug', '3.7', 'docs']
title = 'Update doc for starmap_async error_back kwarg'
updated_at = <Date 2017-10-30.18:48:42.790>
user = 'https://bugs.python.org/tamas'

bugs.python.org fields:

activity = <Date 2017-10-30.18:48:42.790>
actor = 'Mariatta'
assignee = 'docs@python'
closed = True
closed_date = <Date 2017-10-30.18:48:42.792>
closer = 'Mariatta'
components = ['Documentation']
creation = <Date 2017-08-29.20:13:31.257>
creator = 'tamas'
dependencies = []
files = []
hgrepos = []
issue_num = 31304
keywords = ['patch', 'easy']
message_count = 4.0
messages = ['300999', '305244', '305245', '305246']
nosy_count = 3.0
nosy_names = ['docs@python', 'Mariatta', 'tamas']
pr_nums = ['4168', '4177']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue31304'
versions = ['Python 3.6', 'Python 3.7']