[doc issue] volume snapshot upload will retry when it is in UploadFailed status, this should be pointed out in the documentation

[wanghuok]

Describe the bug

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During volume snapshot uploading, I found a time snapshot CR phase is "UploadFailed",
but finally, the snapshot CR phase is "Uploaded", So I'm confused about this state, i guess it will retry when upload failed,
If this is the case it should be clearly stated in the doc.
As a comparison, the documentation clearly states that upload cr will retry if the upload fails

To Reproduce

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Expected behavior

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The doc should state that it will retry in case of snapshot upload failed.
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