Optimizer documentation aligned with code

[michaelpiron]

I brought the documentation of the optimizer methods (profit, cost, self-consumption) in line with the code.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (23aee61) 89.52% compared to head (69db1b5) 89.52%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #143 +/- ## ======================================= Coverage 89.52% 89.52% ======================================= Files 6 6 Lines 1442 1442 ======================================= Hits 1291 1291 Misses 151 151 ```

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[davidusb-geek]

Thanks for these improvements in the documentation