GH-46396: [C++][Documentation][Statistics] Revise the documentation to clarify that arrow::ArrayStatistics is ignored during arrow::Array comparisons

[andishgar]

Rationale for this change

as mentiond here, The document should be clarified that arrow::ArrayStatistics is not inlcuded in the arrow::Array comparasion

What changes are included in this PR?

Add documets for arrow::Array::Equals, arrow::Array::ApproxEquals, arrow::Array::EqualsRange, arrow::ArrayEquals, arrow::ArrayApproxEquals, arrow::ArrayRangeEquals, and arrow::ArrayRangeApproxEquals

Are these changes tested?

No

Are there any user-facing changes?

No

• GitHub Issue: [Discuss][C++][Statistics] Should arrow::Array::Equals() checks wheter two arrow::Array have the same arrow::ArrayStatistics #46396

[github-actions]

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See also:

• Other pull requests
• Contribution Guidelines - Contributing Overview

[github-actions]

⚠️ GitHub issue #46396 has been automatically assigned in GitHub to PR creator.