docs: fix 'retreivedDocs' typo in hanavector self-query retriever #11006

Job	Run time
check-cross-refs	25s
check-generated-files	21s
lint (3.13) / make lint #3.13	22s
links (3.13) / Documentation Build & Link Check (Python 3.13)	2m 9s
test (3.13) / make test #3.13	23s
	3m 40s

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