add warning to use httpetag for r2 (#10498)
* add warning to use httpetag for r2
* Minor edits
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Co-authored-by: Denise Peña <75506267+dcpena@users.noreply.github.com>
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* add warning to use httpetag for r2
* Minor edits
---------
Co-authored-by: Denise Peña <75506267+dcpena@users.noreply.github.com>