slightly diff phrasing, add comment to velocity

bootstrap/spigot/src/main/java/org/geysermc/geyser/platform/spigot/GeyserSpigotPlugin.java

@@ -152,7 +152,7 @@ public class GeyserSpigotPlugin extends JavaPlugin implements GeyserBootstrap {
                 return;
             }
 
-            // Now: Check for velocity mode - deliberately after checking bungeecord because this is a paper config
+            // Now: Check for velocity mode - deliberately after checking bungeecord because this is a paper only option
             if (Bukkit.getServer().spigot().getPaperConfig().getBoolean("proxies.velocity.enabled")) {
                 warnInvalidProxySetups("Velocity");
                 return;

bootstrap/velocity/src/main/java/org/geysermc/geyser/platform/velocity/GeyserVelocityPlugin.java

@@ -113,6 +113,7 @@ public class GeyserVelocityPlugin implements GeyserBootstrap {
 
     @Override
     public void onGeyserEnable() {
+        // If e.g. the config failed to load, GeyserImpl was not loaded and we cannot start
         if (geyser == null) {
             return;
         }