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[ios] Clean up comments in download_manager_coordinator_unittest.mm

This is a follow up to:
https://chromium-review.googlesource.com/c/chromium/src/+/2300834/1/ios/chrome/browser/ui/download/download_manager_coordinator_unittest.mm#708

CL updates comments which explain the reason for wrapping certain code
into @autorelease block.

Bug: None
Change-Id: Ie31e5701f81d6f3fdd8d5347e81441732c1afa75
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303033
Auto-Submit: Eugene But <eugenebut@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789416}