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docs: update comment about r2 requiring locks
Cloudflare R2 doesn't require the use of an external lock when using conditional operation headers like so:
```rust
let s3 = AmazonS3Builder::from_env()
.with_url(url)
.with_region("auto")
.with_access_key_id(&config.s3_access_key_id)
.with_secret_access_key(&config.s3_secret_access_key)
.with_endpoint(&config.s3_endpoint)
// Allows using S3-API without an external locking provider since Cloudflare R2
// provides atomic Put and Copy.
.with_config(
AmazonS3ConfigKey::CopyIfNotExists,
"header: cf-copy-destination-if-none-match: *".to_string(),
)
.build()
```
- https://developers.cloudflare.com/r2/api/s3/extensions/#putobject-1
- https://github.com/apache/arrow-rs/blob/c6ba0f764a9142b74c9070db269de04d2701d112/object_store/src/aws/precondition.rs#L29-L42- Loading branch information
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