arrow

MINOR: [Docs][C++] replace_with_mask links to replace functions (#45223)



### Rationale for this change

`replace_with_mask` should link to the section containing it.

### What changes are included in this PR?

`replace_with_mask` links to the section containing it.

### Are these changes tested?

No.

### Are there any user-facing changes?

Yes, but only in the docs. No code is changed.

Authored-by: Dan King <daniel.zidan.king@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>