docs: improve doctests for complex number instances in array/base/last

[aryan7071]

Resolves a part of #8641

Description

What is the purpose of this pull request?

This pull request:

• Updates REPL and documentation examples in the array/base/last package to use the compact complex instance doctest notation.
• Replaces example decomposition using realf/imagf with concise doctest annotations such as <Complex64>[ 5.0, 6.0 ].
• Removes example-only imports (realf, imagf) where they were only used to show decomposed values.
• Keeps all edits documentation-only (no runtime behavior or type changes).

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [RFC]: Improve doctests for complex number instances in documentation examples (tracking issue) #8641

(Replace the placeholder above with the relevant issue number if applicable.)

Questions

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No.

Other

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No.

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• Read, understood, and followed the contributing guidelines.

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
array/base/last	$\color{green}98/98$ $color{green}+100.00%$	$\color{green}4/4$ $color{green}+100.00%$	$\color{green}1/1$ $color{green}+100.00%$	$\color{green}98/98$ $color{green}+100.00%$

The above coverage report was generated for the changes in this PR.

[stdlib-bot]

⚠️ Tracking Issue Closure Warning ⚠️

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Thank you for your contribution to the project!

[kgryte]

LGTM

[kgryte]

Thank you for your contribution and congratulations on your first PR!