fix javadoc preview bug #224

Job	Run time
Prepare the run	6s
alpine-linux-x64	0s
linux-cross-compile / build (aarch64)	30m 7s
linux-x64 / build (debug)	18m 24s
docs / build (debug)	1m 27s
linux-cross-compile / build (arm)	21m 6s
linux-x64 / build (release)	24m 33s
linux-cross-compile / build (s390x)	21m 24s
linux-cross-compile / build (ppc64le)	27m 18s
linux-x64-hs-minimal / build (debug)	7m 9s
linux-cross-compile / build (riscv64)	28m 0s
linux-x64-hs-nopch / build (debug)	21m 13s
linux-x64-hs-optimized / build (debug)	17m 33s
linux-x64-hs-zero / build (debug)	11m 50s
linux-x86-hs / build (debug)	14m 52s
linux-x86-hs / build (release)	19m 30s
macos-aarch64 / build (debug)	9m 51s
macos-aarch64 / build (release)	6m 54s
macos-x64 / build (debug)	18m 23s
windows-aarch64 / build (debug)	4m 4s
macos-x64 / build (release)	21m 7s
windows-x64 / build (debug)	4m 52s
windows-aarch64 / build (release)	3m 39s
windows-x64 / build (release)	5m 41s
windows-x64	0s
macos-aarch64	0s
linux-x64	0s
macos-x64	0s
	5h 39m 3s

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