Use META_UNDERLINE_ON_HOVER in built-in class reference #602

Job	Run time
📊 Static checks / Code style, file formatting, and docs	4m 5s
🍎 macOS / Editor (target=editor, tests=yes)	21m 29s
🍎 macOS / Template (target=template_release)	35m 19s
🍏 iOS / Template (target=template_release)	31m 42s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	22m 26s
🌐 Web / Template w/o threads (target=template_release, threads=no)	22m 4s
🤖 Android / Template (target=template_release)	29m 19s
🏁 Windows / Editor (target=editor, tests=yes)	45m 5s
🏁 Windows / Template (target=template_release)	31m 19s
🐧 Linux / Editor w/ Mono (target=editor)	38m 38s
🐧 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)	38m 31s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	34m 26s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	29m 7s
🐧 Linux / Template w/ Mono (target=template_release)	23m 54s
🐧 Linux / Minimal template (target=template_release, everything disabled)	17m 25s
🪲 Godot CPP / Build and test Godot CPP	6m 47s
	7h 11m 36s

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