Add some REPL secondary prompt markers

[yangqing]

BPO	44995
Nosy	@terryjreedy, @Julian
PRs	bpo-44995: Remove some incorrect REPL prompt markers #27939
Files	screenshot.png

^{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 = None
created_at = <Date 2021-08-25.02:35:15.366>
labels = ['easy', '3.9', 'docs']
title = '"Hide the prompts and output" works abnormal'
updated_at = <Date 2021-11-13.02:55:48.701>
user = 'https://bugs.python.org/yangqing'

bugs.python.org fields:

activity = <Date 2021-11-13.02:55:48.701>
actor = 'andrei.avk'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2021-08-25.02:35:15.366>
creator = 'yangqing'
dependencies = []
files = ['50235']
hgrepos = []
issue_num = 44995
keywords = ['patch', 'newcomer friendly']
message_count = 1.0
messages = ['400245']
nosy_count = 4.0
nosy_names = ['terry.reedy', 'docs@python', 'Julian', 'yangqing']
pr_nums = ['27939']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue44995'
versions = ['Python 3.9']

[yangqing]

【url】https://docs.python.org/3/tutorial/classes.html
【chapter】9.4. Random Remarks

【problem description】
When I click on the demo "Hide the prompts and output" switch, the class definition statements were also hided.
Please take a look as the appended screenshot.