chore(paper): cleanup project setup main class description

Author: Strokkur424

src/content/docs/paper/dev/getting-started/project-setup.mdx

@@ -141,8 +141,10 @@ This allows for a unique package name for every plugin.
 ### The _main_ class
 
 The main class is the entry point to your plugin and will be the only class that extends
-[`JavaPlugin`](jd:paper:org.bukkit.plugin.java.JavaPlugin) in your plugin.
-This is an example of what your `ExamplePlugin` class could look like:
+[`JavaPlugin`](jd:paper:org.bukkit.plugin.java.JavaPlugin) in your plugin. It is considered
+good practise to **not** name this class `Main`. Instead, choose a more descriptive name,
+like your plugin's name. If your plugin is called `Example`, your main class could be called
+`ExamplePlugin`. An example implementation of this class might look like this:
 
 ```java title="ExamplePlugin.java"
 package io.papermc.testplugin;