Improve `AudioStreamPlaylist` class reference #31660

Job	Run time
📊 Static checks / Code style, file formatting, and docs	35s
🍎 macOS / Editor (target=editor, tests=yes)	28m 22s
🍎 macOS / Template (target=template_release)	21m 27s
🤖 Android / Template (target=template_release)	30m 32s
🍏 iOS / Template (target=template_release)	9m 0s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	25m 36s
🌐 Web / Template w/o threads (target=template_release, threads=no)	25m 25s
🐧 Linux / Editor w/ Mono (target=editor)	40m 19s
🐧 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)	45m 18s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	34m 33s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	30m 41s
🏁 Windows / Editor (target=editor, tests=yes)	47m 50s
🏁 Windows / Template (target=template_release)	34m 34s
🐧 Linux / Template w/ Mono (target=template_release)	25m 28s
🐧 Linux / Minimal template (target=template_release, everything disabled)	13m 34s
🪲 Godot CPP / Build and test Godot CPP	7m 26s
	7h 0m 40s

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