Update C# Rider install steps for now built-in plugin "Godot Support" (#10323)
* Plugin now bundled with rider so can't be installed
As of Rider 2024.2 the plugin is bundled with the software and can't be installed which can be confusing.
https://plugins.jetbrains.com/plugin/13882-godot-support
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Co-authored-by: tetrapod <[email protected]>