fix: Retitle plugin YML page to specifically mention Bukkit (#355)

Author: sowelipililimute

docs/paper/dev/getting-started/plugin-yml.mdx

@@ -3,7 +3,7 @@ slug: /dev/plugin-yml
 description: A guide to Bukkit's plugin.yml file.
 ---
 
-# Plugin YML
+# Bukkit Plugin YML
 
 The `plugin.yml` file is the main configuration file for your plugin.
 It contains information about your plugin, such as its name, version, and description.