fix PHP presigned upload example

[rdimaio]

Summary

Fixes the R2 aws-sdk-php example: adds the missing semicolons to the two print_r() presigned-URL statements and quotes the curl upload URL so the shell does not split it on the & query-parameter separators.

Documentation checklist

• The change adheres to the documentation style guide.

[cloudflare-docs-bot]

Review

✅ No issues found in commit 94d1e88.

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