Spelling and grammar

[Sascha-1]

Correct spelling:
experient -> experiment
on page
https://github.com/Akuli/python-tutorial

Correct grammar:
try to find it from the previous chapters -> try to find it in the previous chapters
on page
https://github.com/Akuli/python-tutorial/blob/master/basics/what-is-programming.md

[Akuli]

fixed