docs: update CONTRIBUTING paths for the monorepo layout (#6594) #15936

Job	Run time
Ready-to-merge gate / Missing "ready-to-merge" label	2s
diff_check / diff_check	3s
detect-changes / Detect file changes	4s
Build legacy macos production	6m 12s
Build new android production	22m 8s
Build new ios production no-frameworks xcframework	8m 40s
Build legacy macos dev	6m 0s
Build new android dev	10m 41s
Build new ios dev no-frameworks xcframework	9m 28s
Test ios production REV2	6m 41s
Test android production REV2	8m 5s
	1h 18m 4s

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