Remove instructions to check if windows is 32-bit or 64-bit.

[hjwp]

Windows 10 was the last version of windows to support 32-bit, that dates back to 10 years ago now, and the latest version, Windows 11, only has 64-bit, since 2021. most manufacturers stopped had stopped building 32-bit computers by 2017 (https://www.quora.com/Are-32-bit-computers-still-being-produced-as-of-2017)

This change proposes we remove the big, fiddly chunk of instructions for "how to check whether you have 32-bit windows",

but! it replaces them with a mention of using 32-bit in the already-existing "what to do if you have any problems" paragraph, later on.

my hope is that this makes life easier for the 90% of users on 64-bit windows, whilst not making things that much worse for people with older PCs.

am aware that other cultural contexts may be v different in respect, where there is a lot of older hardware around!

Changes in this pull request:

[hjwp]

am at the djangogirls event at europython now, so motivated to have another go at this. anything else we need to do before merging @das-g ?

[ekohl]

I don't mind merging this as is, but perhaps clean up while we're at it?

[ekohl]

I spotted this after it's merged.

Suggested change

	Note: If you are using an Windows 10 and the Python {{ book.py_version }} installer fails with an error, then install all Windows Updates and try to install Python again. If you still have the error, try installing the 32-bit version of Python, or try installing an older version, Python {{ book.py_min_release }}, from [Python.org](https://www.python.org/downloads/windows/).
	Note: If you are using Windows 10 and the Python {{ book.py_version }} installer fails with an error, then install all Windows Updates and try to install Python again. If you still have the error, try installing the 32-bit version of Python, or try installing an older version, Python {{ book.py_min_release }}, from [Python.org](https://www.python.org/downloads/windows/).

#1904