Add internal docs for metadata and array behind Extended help wrappers #2462

Job	Run time
Julia 1.10 - ubuntu-latest - x64	15m 38s
Julia 1.10 - macOS-latest - x64	12m 47s
Julia 1.10 - windows-latest - x64	16m 29s
Julia 1 - ubuntu-latest - x64	25m 4s
Julia 1 - macOS-latest - x64	22m 16s
Julia 1 - windows-latest - x64	25m 7s
Julia nightly - ubuntu-latest - x64	26m 52s
	2h 24m 13s

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