Review lesson and exercise numbers from 2.2

[mantczakaus]

2.2.5 Custom resource configuration
2.2.5.1 Process selector hierarchy
2.2.5.1 Viewing resources used
2.2.5.2 Customising with process labels
2.2.5.2 Customising with process names
Exercise 2.2.6.1
Exercise 2.2.6.2
Exercise 2.2.6.3

[mantczakaus]

Lesson 2.3 is also off a bit

[calizilla]

Thanks Magda. I will have a final pass through and check them all after Michael has done his final update - he has completed your changes and is working through some I made on his latest PR so there may be a header or two change again.

Fixed a few more in b957f70