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GH-40833: [Docs][Release] Make explicit in the documentation that verifying binaries is not required in order to case a vote (#40834)

### Rationale for this change

Based on the discussion on https://lists.apache.org/thread/ogp9dthp124oq0fmvlyzvjorjsyom03v making clear that binaries verification are not required in order to cast a positive vote for the release.

### What changes are included in this PR?

Document the required process

### Are these changes tested?

preview-docs job on archery will be run

### Are there any user-facing changes?

No
* GitHub Issue: #40833

Authored-by: Raúl Cumplido <raulcumplido@gmail.com>
Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>