doc: refine WebAssembly error documentation #2382

Job	Run time
Build slim tarball	1m 31s
x86_64-linux: with shared libraries	26m 58s
aarch64-linux: with shared libraries	22m 35s
x86_64-darwin: with shared libraries	42m 9s
aarch64-darwin: with shared libraries	23m 7s
	1h 56m 20s

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