docs: quicker ci (#26810)

as suggested here: https://github.com/supabase/setup-cli/issues/88#issuecomment-1370519155

Co-authored-by: Charis <26616127+charislam@users.noreply.github.com>

apps/docs/content/guides/cli/managing-environments.mdx

@@ -218,7 +218,7 @@ jobs:
           version: latest
 
       - name: Start Supabase local development setup
-        run: supabase start
+        run: supabase db start
 
       - name: Verify generated types are checked in
         run: |