lessons learned, attempt 3

[jerzydziewierz]

As I wait for my encoders to arrive, I was struggling to set up the sensorless mode.

This docs update contains the lessons learned.

Plus,

• minor grammar updates
• Python code now uses classic 4 spaces instead of 3 or 5

[samuelsadok]

Did you try to build the docs locally to check if all looks good?

Note that in rST the required indentation is sometimes inconsistent so I'm not sure if 3 spaces vs 4 spaces indentation give the same result. Also a new line might be required after .. code:.

[samuelsadok]

this should probably be one line above