[workers] add Changing Usage Models subheading

[rohinlohe]

Summary

Adding back a subheading & documenting the end of the note. Adding some additional info specifying that changing the usage model only impacts billing.

Helpful to pass this as a link to customers.

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Added a subheading for changing usage models and clarified that changes only affect billing.

• Introduced a new subheading for changing usage models in the documentation.
• Clarified that changing the usage model impacts billing only, with no technical implications.
• Updated links to direct users to specific sections in the Cloudflare dashboard.

Modified Files

• src/content/docs/workers/platform/pricing.mdx

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[github-actions]

Preview URL: https://0ad310b0.preview.developers.cloudflare.com
Preview Branch URL: https://rohin-usage-models.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/workers/platform/pricing/	https://rohin-usage-models.preview.developers.cloudflare.com/workers/platform/pricing/