fix(docs): correct schema load duration to apollo.router.schema.load.duration

[lrlna]

The in-memory cache documentation was referencing an incorrect metric to track schema load times. Previously it was referred to as apollo.router.schema.loading.time, where the metric being emitted by the router since router@2.0.0 is apollo.router.schema.load.duration. This is now fixed in the docs.

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• Changes are compatible¹
• Documentation² completed
• Performance impact assessed and acceptable
• Metrics and logs are added³ and documented
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  • Manual Tests

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[svc-apollo-docs]

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* graphos/routing/(latest)/performance/caching/in-memory.mdx

Build ID: ba9e541f471d3a68d8be0dfc

URL: https://www.apollographql.com/docs/deploy-preview/ba9e541f471d3a68d8be0dfc