Remove weakref.ReferenceError entry from documentation

[mjpieters]

BPO	38374
Nosy	@mjpieters, @miss-islington, @rogerhurwitz
PRs	bpo-38374: Remove weakref.ReferenceError from docs #18452 [3.8] bpo-38374: Remove weakref.ReferenceError from docs (GH-18452) #18454 [3.7] bpo-38374: Remove weakref.ReferenceError from docs (GH-18452) #18455

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

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GitHub fields:

assignee = None
closed_at = <Date 2020-02-11.07:00:10.729>
created_at = <Date 2019-10-04.22:55:21.525>
labels = ['3.7', '3.8', 'docs']
title = 'Remove weakref.ReferenceError entry from documentation'
updated_at = <Date 2020-02-11.07:02:04.992>
user = 'https://github.com/mjpieters'

bugs.python.org fields:

activity = <Date 2020-02-11.07:02:04.992>
actor = 'miss-islington'
assignee = 'docs@python'
closed = True
closed_date = <Date 2020-02-11.07:00:10.729>
closer = 'gvanrossum'
components = ['Documentation']
creation = <Date 2019-10-04.22:55:21.525>
creator = 'mjpieters'
dependencies = []
files = []
hgrepos = []
issue_num = 38374
keywords = ['patch']
message_count = 5.0
messages = ['353977', '361768', '361784', '361785', '361786']
nosy_count = 4.0
nosy_names = ['mjpieters', 'docs@python', 'miss-islington', 'rogerhurwitz']
pr_nums = ['18452', '18454', '18455']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue38374'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

[mjpieters]

The weakref documentation still mentions weakref.ReferenceError:

https://docs.python.org/3/library/weakref.html#weakref.ReferenceError

But this alias for the built-in ReferenceError exception was removed in the 3.0 development cycle (2633c69#diff-b7975e9ef5a6be5f64e9bb391de03057), the last version where weakref.ReferenceError still exists is Python 2.7.

Please remove it, it's just confusing now.

[rogerhurwitz]

At PyCascades CPython sprint and reviewing this issue.

[miss-islington]

New changeset 4eb9f43 by Roger Hurwitz in branch 'master':
bpo-38374: Remove weakref.ReferenceError from docs (GH-18452)
4eb9f43

[miss-islington]

New changeset fcfc3c8 by Miss Islington (bot) in branch '3.7':
bpo-38374: Remove weakref.ReferenceError from docs (GH-18452)
fcfc3c8

[miss-islington]

New changeset 3f8d181 by Miss Islington (bot) in branch '3.8':
bpo-38374: Remove weakref.ReferenceError from docs (GH-18452)
3f8d181