docs(r2): clarify bucket lock enforcement boundary

[krys-cf]

Summary

Clarifies when R2 bucket lock rules begin enforcing mutations and how new object creation is handled.

Related: DEE-3872

Documentation checklist

• The change adheres to the documentation style guide.

[cloudflare-docs-bot]

Review

✅ No issues found in commit dd8f33e.

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[cloudflare-docs-bot]

Review coverage

🟡 1 ownership area needs approval.

Suggested reviewers: @irvinebroque

Needs approval	Eligible approvers	Suggested
r2	@harshil1712, @helloimalastair, @jonesphillip, @rdimaio, @cloudflare/product-owners	irvinebroque

CODEOWNERS mappings for displayed areas (1)

Pattern	Owners
/src/content/docs/r2/	@harshil1712, @helloimalastair, @jonesphillip, @rdimaio, @cloudflare/product-owners