arrow

GH-36131: [Docs] Use https://arrow.apache.org/julia/ for Julia URL (#36156)

### Rationale for this change

The Julia implementation's URL was changed to  https://arrow.apache.org/julia/ .

### What changes are included in this PR?

Use it.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

Yes.
* Closes: #36131

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