Update object_storage.md to fix the object store connection using iam

Merged Xiaogang Wen requested to merge xiaogang-doc-patch-234 into master

What does this MR do?

A simple patch to fix the gitlab_rails['object_store_connection'] definition for consolidated object storage example using iam profile which should be gitlab_rails['object_store']['connection'] .

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Edited by Xiaogang Wen