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GH-38950: [Docs] Fix spelling (#38951)



### Rationale for this change

### What changes are included in this PR?

Spelling fixes to docs/

### Are these changes tested?

### Are there any user-facing changes?

* Closes: #38950

Lead-authored-by: Josh Soref <2119212+jsoref@users.noreply.github.com>
Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
Signed-off-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>