Fix API doc, detected by clang++ -Wdocumentation #97

Job	Run time
build (ubuntu-22.04, Debug, static, 5.15)	1m 12s
build (ubuntu-22.04, Debug, static, 6.6.0)	1m 28s
build (ubuntu-22.04, Debug, dynamic, 5.15)	1m 10s
build (ubuntu-22.04, Debug, dynamic, 6.6.0)	1m 21s
build (ubuntu-22.04, Release, static, 5.15)	57s
build (ubuntu-22.04, Release, static, 6.6.0)	57s
build (ubuntu-22.04, Release, dynamic, 5.15)	44s
build (ubuntu-22.04, Release, dynamic, 6.6.0)	1m 1s
build (windows-2022, Debug, static, 5.15)	2m 40s
build (windows-2022, Debug, static, 6.6.0)	2m 52s
build (windows-2022, Debug, dynamic, 5.15)	3m 4s
build (windows-2022, Debug, dynamic, 6.6.0)	2m 36s
build (windows-2022, Release, static, 5.15)	1m 58s
build (windows-2022, Release, static, 6.6.0)	1m 16s
build (windows-2022, Release, dynamic, 5.15)	4m 17s
build (windows-2022, Release, dynamic, 6.6.0)	1m 39s
build (macos-13, Debug, static, 5.15)	4m 49s
build (macos-13, Debug, static, 6.6.0)	3m 41s
build (macos-13, Debug, dynamic, 5.15)	3m 17s
build (macos-13, Debug, dynamic, 6.6.0)	4m 46s
build (macos-13, Release, static, 5.15)	1m 3s
build (macos-13, Release, static, 6.6.0)	2m 16s
build (macos-13, Release, dynamic, 5.15)	1m 18s
build (macos-13, Release, dynamic, 6.6.0)	1m 55s
build (ubuntu-22.04, Release, dynamic, 6.6.0, llvm, shiboken6-generator==6.6.0 pyside6==6.6.0)	1m 47s
	54m 4s

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