Add note about usage billing limitations to GraphQL

[rianvdm]

https://developers.cloudflare.com/analytics/graphql-api/

GraphQL should not be used to calculate billable traffic. This causes confusion so we're adding a note so that CSMs can point to official documentation about it.

[hyperlint-ai]

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PR Change Summary

Added a note regarding billing limitations for GraphQL usage to clarify that it should not be used for calculating billable traffic.

• Introduced a new section on limitations for the GraphQL API.
• Clarified that GraphQL data should not be used for billing calculations.
• Provided context on what constitutes billable traffic versus overall usage.

Modified Files

• src/content/docs/analytics/graphql-api/index.mdx

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