[Backport release-3_40] qgsvectorlayer.h: move a documentation section to the appropriate place #36214

Job	Run time
build (22.04, 5, true, OFF, ON, ON, ON, ON, OFF, OFF, OFF, OFF, ON, false)	1h 48m 23s
build (39, 6, true, ON, OFF, ON, ON, OFF, OFF, ON, ON, ON, OFF, false)	3h 9m 44s
Run tests (5, ALL_BUT_PROVIDERS)	31m 12s
Run tests (5, POSTGRES)	6m 7s
clang-tidy (22.04, 5)	4m 56s
Run tests (5, HANA)	6m 31s
Run tests (6, ALL_BUT_PROVIDERS)	36m 51s
Run tests (5, ORACLE, 22.04, binary-for-oracle)	6m 20s
	6h 30m 4s

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