Doc: Remove native method override stuff from gdextension.rst #169

Job	Run time
cache-env	1s
🧪 Unit tests	3m 22s
🍎 macOS / Editor (x86_64, release)	5m 57s
🐧 Linux / Editor (x86_64, release)	14m 29s
🍎 macOS / Editor (arm64, release)	5m 4s
🪟 Windows / Editor (x86_64, release)	8m 17s
🔌 GDExtension / 🐧 Linux (x86_64, release)	1m 4s
🐧 Linux / Template (x86_64, release)	10m 14s
🪟 Windows / Editor .NET (x86_64, release)	11m 52s
🔌 GDExtension / 🐧 Linux (x86_64, debug)	2m 13s
🔌 GDExtension / 🪟 Windows (x86_64, release)	2m 30s
🔌 GDExtension / 🪟 Windows (x86_64, debug)	2m 54s
🔌 GDExtension / 🍎 macOS (universal, release)	1m 10s
🔌 GDExtension / 🍎 macOS (universal, debug)	1m 13s
🍎 macOS / Make macOS Bundles	1m 29s
	1h 11m 49s

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