Deleted comma, added new video link for Win95 guide, fixed string concatenation

[Hahlh]

Support for the edit:
Grammarly: Comma before "and"

Thank you for the beautiful article and your contentious work to improve it!

Leo

[Hahlh]

The video in the section "Briefly on the subject of Microsoft" is not displayed anymore. The message reads something along the lines of: "The channel was banned on the basis of many reports about copyright infringements".

At the same time the original video and the channel are still accessible through Youtube directly.

I exchanged the old link for an alternative identical one.
This should be tested, before it is merged.

[Hahlh]

Section 6.2

This sort of thing really happens, and part of the job is remembering that 4 + 20 is 24 and 4 + “20” is “420”.
would trigger:
TypeError: unsupported operand type(s) for +: 'int' and 'str'

I changed it to:

This sort of thing really happens, and part of the job is remembering that 4 + 20 is 24 and "4" + “20” is “420”.