tools: fix small inconsistencies in JSON doc output #3233

Job	Run time
Build slim tarball	1m 30s
aarch64-darwin: with shared libraries	39m 37s
x86_64-linux: with shared libraries	34m 54s
x86_64-darwin: with shared libraries	1h 18m 17s
aarch64-linux: with shared libraries	32m 21s
	3h 6m 39s

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