Fix `RenderingServer.instance_set_transform` docs saying it's not global #27125

Job	Run time
📊 Static checks / Code style, file formatting, and docs	3m 49s
🍎 macOS / Editor (target=editor, tests=yes)	3m 57s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	4m 45s
🍎 macOS / Template (target=template_release)	5m 11s
🌐 Web / Template w/o threads (target=template_release, threads=no)	4m 22s
🍏 iOS / Template (target=template_release)	4m 8s
🤖 Android / Template (target=template_release)	4m 16s
🐧 Linux / Editor w/ Mono (target=editor)	6m 20s
🏁 Windows / Editor (target=editor, tests=yes)	10m 25s
🐧 Linux / Editor with doubles and GCC sanitizers (target=editor, tests=yes, dev_build=yes, scu_build=yes, precision=double, use_asan=yes, use_ubsan=yes, linker=gold)	18m 15s
🏁 Windows / Template (target=template_release)	8m 0s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	8m 17s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	8m 19s
🐧 Linux / Template w/ Mono (target=template_release)	5m 29s
🐧 Linux / Minimal template (target=template_release, everything disabled)	5m 35s
🪲 Godot CPP / Build and test Godot CPP	7m 7s
	1h 48m 15s

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