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MINOR: [Release] Fix issue listing versions in post-10-docs.sh (#44567)

### Rationale for this change

While testing the docs script (post-10-docs.sh) during the 18 release process, I noticed that the 16.1 docs got moved underneath the 17.0 docs folder. i.e., moved to `docs/17.0/16.1`. Which isn't right. This is because the previous glob pattern was `*.0` which doesn't match `16.1`.

### What changes are included in this PR?

Just a change to post-10-docs.sh updating the glob.

### Are these changes tested?

Yes, locally. I used this updated script to generate https://github.com/apache/arrow-site/pull/553.

### Are there any user-facing changes?

No.

Authored-by: Bryce Mecum <petridish@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>