Updates to systems documentation

Update systems documentation

Description

Adds info on minimal required input and why there is no mass scaling factor for the furnishing system.

Related Issue(s)

• Resolves aircraft-design#143 (closed)

Developer Checklist

• Code has been tested locally and/or in pipeline.
• (if applicable) documentation updated.
• (if applicable) impact of new dependencies reviewed and included in project.
• Merge conflicts resolved with the target branch.

added modulesystems_design typedocumentation labels

requested review from @johannes.schneider

assigned to @ellen.seabrooke

requested review from @kristina.mazur

removed review request for @kristina.mazur

requested review from @kristina.mazur

approved this merge request

Thanks! Ready to merge

merged

mentioned in commit 43d202d6