Documentation: Fixed reference to doc/debug-messages.dox file #176

Job	Run time
CodeQL-tests	23m 41s
source-maintenance-tests	2m 52s
build-tests(ubuntu-22.04,gcc,default)	6m 25s
functionality-tests	17m 28s
build-tests(ubuntu-22.04,gcc,minimal)	4m 8s
build-tests(ubuntu-22.04,gcc,maximus)	6m 15s
build-tests(ubuntu-22.04,clang,default)	7m 35s
build-tests(ubuntu-22.04,clang,minimal)	6m 6s
build-tests(ubuntu-22.04,clang,maximus)	7m 32s
	1h 22m 2s

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