`fvm list` complains about semver when it's not relevant

[matthew-carroll]

When I run fvm list it complains about my custom fork name not following semvar:

But the directions for naming forked versions doesn't mention semvers: https://fvm.app/documentation/advanced/custom-version

Either the docs should be updated to explain how a developer should apply semvers to custom fork naming, or the semver complaint should be turned off for custom versions.