There are three feedback forums on the first page of the Basics section (and included below for convenience). The first for critical feedback such as problems within the system, the second for minor feedback like spelling, grammar, mistaken references, etc, the third for suggestions such as new Traits, Spells, Rules, etc.
Critical Feedback: https://forms.gle/GpwNjdzTZACaeFkVA
Minor Corrections: https://forms.gle/4CBrKMfu8Cwwxs2T7
Suggestions!: https://forms.gle/LfxR3nacYzjFwUtq9