[R2] Adding infrequent access storage example

[Oxyjun]

Summary

Currently, there's a redundant example. We're repurposing that example to deal with Infrequent Access storage example to diversify the examples we show.

The four examples are:

1. Standard storage: highlights regular R2 usage, but within free-tier limits.
2. Standard storage: highlights using R2 to simply store (and not read/write) objects for a month.
3. IA storage: highlights using R2 to simply store objects, thereby showcasing the cost-efficiency for using IA.
4. IA storage: highlights active R2 usage, which will incur higher cost than Standard storage.

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• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.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

Updated the R2 documentation to include an example for Infrequent Access storage, replacing a redundant example to enhance clarity and diversity in the documentation.

• Repurposed an existing example to illustrate Infrequent Access storage.
• Updated cost estimates and usage details for the new example.
• Clarified the distinction between standard and infrequent access storage in the documentation.

Modified Files

• src/content/docs/r2/pricing.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/r2/	@oxyjun, @elithrar, @jonesphillip, @aninibread, @harshil1712, @cloudflare/workers-docs, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://0811e220.preview.developers.cloudflare.com
Preview Branch URL: https://jun-r2-billing-example.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/r2/pricing/	https://jun-r2-billing-example.preview.developers.cloudflare.com/r2/pricing/