feat: Document allow-remote-ender-dragon-respawning setting (#628)

Author: Strokkur424

src/config/paper/paper-world-defaults.yml

@@ -948,6 +948,14 @@ max-growth-height:
     default: "3"
     description: Maximum height sugar cane/reeds blocks will naturally grow to
 misc:
+  allow-remote-ender-dragon-respawning:
+    default: "false"
+    vanilla: "true"
+    description: >-
+      Disables an optimization which verifies that end crystals placed in the end
+      are placed on the portal frame before any attempt is made at respawning
+      the ender dragon. Enabling this setting allows remote ender dragon
+      respawning to work again.
   disable-end-credits:
     default: "false"
     description: >-