Improve documentation concerning Economic viability tables

[kaskranenburgQ]

There are still some open to-do's that need to be fixed concerning the documentation & labeling of the economic viability tables:

• Clear up the term WTP in the table, in the documentation we should write out the term willingness-to-pay. We should also clearly state that the unit of the WTP is MWh-input. Unlike the other columns, which are in MWh-output.
• Check whether the system cost documentation is sufficient enough concerning connection and transport costs.

[github-actions]

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