Add doctests for lineage relationship helpers #130

Job	Run time
Documentation	1m 32s
Julia nightly - ubuntu-latest - x64 - pull_request	1m 34s
Julia 1.10 - macos-latest - x64 - pull_request	2m 25s
Julia 1.11 - ubuntu-latest - x64 - pull_request	1m 33s
Julia 1.11 - windows-latest - x64 - pull_request	2m 34s
Julia 1.10 - ubuntu-latest - x86 - pull_request	1m 27s
Julia 1.10 - ubuntu-latest - x64 - pull_request	1m 17s
Julia nightly - windows-latest - x64 - pull_request	2m 11s
Julia nightly - macos-latest - x64 - pull_request	2m 52s
Julia 1.11 - macos-latest - x64 - pull_request	3m 16s
Julia 1.10 - windows-latest - x64 - pull_request	1m 56s
	22m 37s

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