ARROW-11819: [Rust] Add link to the doc
ARROW-11819: [Rust] Add link to the doc

This is a test PR with a minor fix, that has no JIRA issue, that I am using to validate my new fancy script (https://github.com/apache/arrow/pull/9598). However, I think it is a reasonable change on its own

Closes #9594 from alamb/alamb/test_change

Authored-by: Andrew Lamb <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@nerdnetworks.org>
Signed-off-by: Andrew Lamb <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@nerdnetworks.org>

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