docs: fix image that was reverted by arch split #13079
                
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What this PR does
This fixes the read path diagram which marked the query-scheduler as required in #12609. It was incorrectly overwritten in #12806.
Which issue(s) this PR fixes or relates to
Related #12609
Related #12806
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX]. If changelog entry is not needed, please add thechangelog-not-neededlabel to the PR.about-versioning.mdupdated with experimental features.