Document how to get Python's bin / Scripts directory

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-04-15.02:40:38.947>
labels = ['3.8', '3.9', '3.10', 'docs']
title = "Document how to get Python's bin / Scripts directory"
updated_at = <Date 2020-10-22.21:09:34.587>
user = 'https://github.com/thautwarm'

bugs.python.org fields:

activity = <Date 2020-10-22.21:09:34.587>
actor = 'eric.araujo'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2020-04-15.02:40:38.947>
creator = 'thautwarm'
dependencies = []
files = []
hgrepos = []
issue_num = 40289
keywords = []
message_count = 1.0
messages = ['366480']
nosy_count = 2.0
nosy_names = ['docs@python', 'thautwarm']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue40289'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']