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

[alamb]

This is a test PR with a minor fix, that has no JIRA issue, that I am using to validate my new fancy script (#9598). However, I think it is a reasonable change on its own

[github-actions]

Thanks for opening a pull request!

Could you open an issue for this pull request on JIRA?
https://issues.apache.org/jira/browse/ARROW

Then could you also rename pull request title in the following format?

ARROW-${JIRA_ID}: [${COMPONENT}] ${SUMMARY}

See also:

• Other pull requests
• Contribution Guidelines - How to contribute patches

[codecov-io]

Codecov Report

Merging #9594 (d06a866) into master (b26488d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #9594   +/-   ##
=======================================
  Coverage   82.32%   82.32%           
=======================================
  Files         245      245           
  Lines       56414    56414           
=======================================
  Hits        46445    46445           
  Misses       9969     9969           

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[github-actions]

https://issues.apache.org/jira/browse/ARROW-11807

[github-actions]

https://issues.apache.org/jira/browse/ARROW-11815

[github-actions]

https://issues.apache.org/jira/browse/ARROW-11816

[github-actions]

https://issues.apache.org/jira/browse/ARROW-11817

[github-actions]

https://issues.apache.org/jira/browse/ARROW-11818

[github-actions]

https://issues.apache.org/jira/browse/ARROW-11819