Mention Multiplayer.`get_remote_sender_id`'s 0 after await #458

Job	Run time
📊 Static checks / Code style, file formatting, and docs	3m 13s
🤖 Android / Template (target=template_release)	29m 12s
🍎 macOS / Editor (target=editor, tests=yes)	27m 40s
🍏 iOS / Template (target=template_release)	14m 23s
🐧 Linux / Editor w/ Mono (target=editor)	35m 38s
🍎 macOS / Template (target=template_release)	44m 26s
🐧 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)	35m 48s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	21m 3s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	32m 0s
🏁 Windows / Editor (target=editor, tests=yes)	41m 14s
🌐 Web / Template w/o threads (target=template_release, threads=no)	21m 1s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	27m 35s
🏁 Windows / Template (target=template_release)	28m 46s
🐧 Linux / Template w/ Mono (target=template_release)	23m 16s
🐧 Linux / Minimal template (target=template_release, everything disabled)	13m 40s
🪲 Godot CPP / Build and test Godot CPP	7m 5s
	6h 46m 0s

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