gzip.py: explain optional argument mtime

[jwuttke]

BPO	43848
Nosy	@jwuttke
PRs	bpo-43848: explain optional argument mtime in gzip.py. #25410

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-04-14.18:30:43.146>
labels = ['3.10', 'docs']
title = 'gzip.py: explain optional argument mtime'
updated_at = <Date 2021-04-14.18:46:52.787>
user = 'https://github.com/jwuttke'

bugs.python.org fields:

activity = <Date 2021-04-14.18:46:52.787>
actor = 'jwuttke'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2021-04-14.18:30:43.146>
creator = 'jwuttke'
dependencies = []
files = []
hgrepos = []
issue_num = 43848
keywords = ['patch']
message_count = 1.0
messages = ['391093']
nosy_count = 2.0
nosy_names = ['docs@python', 'jwuttke']
pr_nums = ['25410']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue43848'
versions = ['Python 3.10']

[jwuttke]

Explain the data type of optional argument mtime: seconds since the epoch.

As an alternative to mtime = None, recommend mtime = 0 for generating deterministic streams.