DOC: Add link to sys.exc_info for "Reference Manual"

BPO	36270
Nosy	@JulienPalard, @Mariatta, @csabella, @miss-islington
PRs	bpo-36270: add link to traceback object reference in sys.exc_info docs #13119 [3.8] bpo-36270: Doc: add link to traceback object reference (GH-13119) #16002

^{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 = 'https://github.com/Mariatta'
closed_at = <Date 2019-09-12.13:48:59.268>
created_at = <Date 2019-03-12.14:14:36.926>
labels = ['type-feature', '3.8', 'docs']
title = 'DOC: Add link to sys.exc_info for "Reference Manual"'
updated_at = <Date 2019-09-12.13:48:59.267>
user = 'https://github.com/csabella'

bugs.python.org fields:

activity = <Date 2019-09-12.13:48:59.267>
actor = 'mdk'
assignee = 'Mariatta'
closed = True
closed_date = <Date 2019-09-12.13:48:59.268>
closer = 'mdk'
components = ['Documentation']
creation = <Date 2019-03-12.14:14:36.926>
creator = 'cheryl.sabella'
dependencies = []
files = []
hgrepos = []
issue_num = 36270
keywords = ['patch']
message_count = 3.0
messages = ['337740', '352005', '352008']
nosy_count = 4.0
nosy_names = ['mdk', 'Mariatta', 'cheryl.sabella', 'miss-islington']
pr_nums = ['13119', '16002']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue36270'
versions = ['Python 3.8']