On wasm, provide intradoc-link for `spawn()` function in `EventLoop` docs #4851

Job	Run time
Check formatting	8s
Run cargo-deny on Android	32s
Run cargo-deny on iOS	34s
Test stable Windows 64bit MSVC	2m 36s
Run cargo-deny on Linux	34s
Test stable Windows 32bit MSVC	4m 28s
Run cargo-deny on macOS	30s
Test stable Windows 64bit GNU	3m 51s
Run cargo-deny on Redox OS	30s
Test stable Windows 32bit GNU	4m 35s
Run cargo-deny on web	28s
Test stable Linux 32bit	7m 15s
Run cargo-deny on Windows	26s
Test stable Linux 64bit	6m 31s
Test stable X11	4m 19s
Test stable Wayland	5m 23s
Test stable Android	1m 31s
Test stable Redox OS	23s
Test stable macOS	1m 58s
Test stable iOS x86_64	1m 42s
Test stable iOS Aarch64	2m 11s
Test stable web	1m 26s
Test nightly Windows 64bit MSVC	2m 35s
Test nightly Windows 32bit MSVC	2m 19s
Test nightly Windows 64bit GNU	4m 20s
Test nightly Windows 32bit GNU	2m 51s
Test nightly Linux 32bit	5m 6s
Test nightly Linux 64bit	5m 2s
Test nightly X11	5m 20s
Test nightly Wayland	3m 25s
Test nightly Android	1m 31s
Test nightly Redox OS	28s
Test nightly macOS	2m 10s
Test nightly iOS x86_64	1m 19s
Test nightly iOS Aarch64	1m 21s
Test nightly web	1m 12s
Test 1.65.0 Windows 64bit MSVC	1m 48s
Test 1.65.0 Windows 32bit MSVC	1m 45s
Test 1.65.0 Windows 64bit GNU	1m 36s
Test 1.65.0 Windows 32bit GNU	2m 7s
Test 1.65.0 Linux 32bit	3m 29s
Test 1.65.0 Linux 64bit	1m 49s
Test 1.65.0 X11	1m 49s
Test 1.65.0 Wayland	1m 20s
Test 1.65.0 Redox OS	1m 0s
Test 1.65.0 macOS	1m 20s
Test 1.65.0 iOS x86_64	1m 21s
Test 1.65.0 iOS Aarch64	1m 18s
Test 1.65.0 web	1m 26s
Test 1.69.0 Android	1m 56s
	1h 54m 54s

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