Indentation explanation is unclear

GitHub fields:

assignee = 'https://github.com/Mariatta'
closed_at = None
created_at = <Date 2019-02-10.17:26:57.476>
labels = ['type-feature', '3.7', 'docs']
title = 'Indentation explanation is unclear'
updated_at = <Date 2021-10-23.12:51:22.312>
user = 'https://bugs.python.org/JrmeLAURENS'

bugs.python.org fields:

activity = <Date 2021-10-23.12:51:22.312>
actor = 'leduyquang753'
assignee = 'Mariatta'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2019-02-10.17:26:57.476>
creator = 'J\xc3\xa9r\xc3\xb4me LAURENS'
dependencies = []
files = []
hgrepos = []
issue_num = 35957
keywords = []
message_count = 4.0
messages = ['335165', '335300', '335892', '404871']
nosy_count = 5.0
nosy_names = ['docs@python', 'willingc', 'Mariatta', 'J\xc3\xa9r\xc3\xb4me LAURENS', 'leduyquang753']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue35957'
versions = ['Python 3.7']