trigger docs ci from main instead of stable

Author: JasonVranek

.github/workflows/docs.yml

@@ -3,7 +3,7 @@ name: Docs
 on:
   push:
     branches:
-      - stable
+      - main
     # Review gh actions docs if you want to further define triggers, paths, etc
     # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#on