MINOR: [Docs] Fix typos in rst files

[omahs]

Rationale for this change

Improving docs by removing typos

What changes are included in this PR?

Fix typos in rst files

Are these changes tested?

Documentation-only changes

Are there any user-facing changes?

Documentation-only changes

[kou]

Could you use our PR template instead of removing it entirely?

[omahs]

@kou Yes, sure. I just edited it according to the template.

[kou]

@github-actions crossbow submit preview-docs

[github-actions]

Revision: 5dedefb

Submitted crossbow builds: ursacomputing/crossbow @ actions-4a4ba56580

Task	Status
preview-docs

[kou]

Could you fix lint errors?

https://github.com/apache/arrow/actions/runs/14858430016/job/41719078636?pr=46335#step:6:25

 Sphinx Lint..............................................................Failed
- hook id: sphinx-lint
- exit code: 1

docs/source/developers/benchmarks.rst:162: trailing whitespace (trailing-whitespace)
docs/source/developers/benchmarks.rst:163: trailing whitespace (trailing-whitespace)

[kou]

Preview URL: http://crossbow.voltrondata.com/pr_docs/46335

[zanmato1984]

LGTM. Thank you for fixing the typo!

[kou]

+1

[conbench-apache-arrow]

After merging your PR, Conbench analyzed the 4 benchmarking runs that have been run so far on merge-commit e2a5b4e.

There were no benchmark performance regressions. 🎉

The full Conbench report has more details. It also includes information about 10 possible false positives for unstable benchmarks that are known to sometimes produce them.