docs: clarify timeout hierarchy in traffic shaping documentation

[abernix]

Add explanation that router timeout should be >= subgraph timeouts.

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[apollo-librarian]

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* graphos/routing/(latest)/performance/traffic-shaping.mdx

Build ID: e87536b69ea5bd0de7236fdc
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URL: https://www.apollographql.com/docs/deploy-preview/e87536b69ea5bd0de7236fdc