fix: improve otel fanout docs discoverability [closes DOC-796] #8879

Job	Run time
check-generated-files	25s
test (3.13) / make test #3.13	26s
lint (3.13) / make lint #3.13	39s
links (3.13) / Documentation Build & Link Check (Python 3.13)	2m 40s
	4m 10s

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