Update setting name and description to match recent PR changes

Meaning it changes two things:
1. Renames the setting to allow-remote-ender-dragon-respawning
2. Changes the description text in order to accomodate for this change. I've also gone ahead and separated the paragraphs between the feature backed by the config values and the results of enabling/disabling the setting

Author: Strokkur424

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

@@ -964,13 +964,16 @@ misc:
       Determines if the server will interrupt a sprinting player if they are
       attacked. When set to true, you may be subject to a Vanilla bug where
       sprinting is stopped and started when attacking players.
-  dragon-spawn-attempt-performance-improvements:
-    default: "true"
-    vanilla: "false"
+  allow-remote-ender-dragon-respawning:
+    default: "false"
+    vanilla: "true"
     description: >-
-      Optimizes dragon respawn attempt checks by first verifying whether a
-      placed end crystal in the end is actually located on the portal before
-      attempting to respawn the dragon.
+      The feature backed by this setting optimizes dragon respawn attempt checks by
+      first verifying whether a placed end crystal in the end is actually located on
+      the portal before attempting to respawn the dragon.
+
+      This only takes effect if this value is set to false. Setting it to true
+      disables this optimization.
   legacy-ender-pearl-behavior:
     default: "false"
     description: >-