Issue #3628393 by leandro713: Document asset overwrite behavior

leandro vazquez cervantesrequested to merge
issue/drupal-3628393:3628393-document-asset-overwrite-behavior into main

Closes #3628393

The dumpToUri() implementation preserves an existing file at the supplied URI, but this behavior was not documented by AssetDumperUriInterface.

This merge request documents the existing behavior in the $uri parameter description.

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