feat(telemetry): add active subgraph requests attribute to router ove…

[faisalwaseem]

Modified the selectors section to reflect the active_subgraph_requests properly

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Checklist

Complete the checklist (and note appropriate exceptions) before the PR is marked ready-for-review.

• PR description explains the motivation for the change and relevant context for reviewing
• PR description links appropriate GitHub/Jira tickets (creating when necessary)
• Changeset is included for user-facing changes
• Changes are compatible¹
• Documentation² completed
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• Metrics and logs are added³ and documented
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[apollo-librarian]

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* graphos/routing/(latest)/observability/router-telemetry-otel/enabling-telemetry/selectors.mdx

Build ID: bede6912468739aecb1ad1cb
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URL: https://www.apollographql.com/docs/deploy-preview/bede6912468739aecb1ad1cb

[mabuyo]

Removed the other attribute to keep it focused! Thanks for the change