Change definition of AC-line and remove "high" from it

[f-innatech]

Description of the issue

Current definition: "An AC-line is a powerline for transferring high voltage alternating current."@en

I dont think "high" should be in there.

Ideas of solution

Either remove "high" or rename the term to "high-voltage AC-line".

I think option 1 makes more sense and if necessary subtypes of different voltage can be added or post-composed for annotation.

Workflow checklist

• [ ] I discussed the issue with someone else than me before working on a solution
• [ ] I already read the latest version of the workflow for this repository
• [ ] The goal of this ontology is clear to me

I am aware that

• [ ] every entry in the ontology should have a definition
• [ ] classes should arise from concepts rather than from words