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GH-34029: [Docs] Add Ninja to packages to install (#34040)



### Rationale for this change

I built it on Ubuntu22.04 according to [Building Arrow C++](https://arrow.apache.org/docs/dev/developers/cpp/building.html).
Then the build will fail due to missing Ninja.

### What changes are included in this PR?

Update document to also install `ninja-build`.

### Are these changes tested?

Document updates only.

### Are there any user-facing changes?

* Closes: #34029

Authored-by: abetomo <abe@enzou.tokyo>
Signed-off-by: Weston Pace <weston.pace@gmail.com>