docs(durable-objects): fix duplicated million in pricing example

[HaoChiBao]

Summary

• Fix a duplicated unit word in Example 4: 21,610,000 million requests → 21,610,000 requests.

Why

The preceding lines already compute 10,000 + (432M / 20) = 21,610,000. The extra "million" is a typo, not a change to the pricing model.

Related: #32590 discusses billable-unit rounding separately; that needs Billing/DO confirmation before examples are recalculated (see closed #32621).

Test plan

• Example 4 request bullet reads 21,610,000 requests and still matches the arithmetic above it

[cloudflare-docs-bot]

Review

✅ No issues found in commit f9a5f69.

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