Trivial confusion in plugin creation guide

Godot 4.2.2 stable

The Inspector Plugins guide has a tiny confusion.

Problematic URL: [Inspector Plugins](https://docs.godotengine.org/en/stable/tutorials/plugins/editor/inspector_plugins.html)

To my own embarrassment, I found this documentation to be confusing. The problem is under the first header of the Inspector Plugins page. "plugin.gd" is the default name of the script whenever you use the Create New Plugin dialog - but most people will overwrite this default name immediately. It's easy enough to infer what is being asked of the coder, but still.