docs: replace integers by double values in math/base/special/fibonacci

[gunjjoshi]

Resolves None.

Description

What is the purpose of this pull request?

This pull request:

• replaces the use of integers by double values in math/base/special/fibonacci.

Related Issues

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This pull request:

• resolves None.

Questions

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No.

Other

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Checklist

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• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[gunjjoshi]

Sorry for missing this in #7923.

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/fibonacci	$\color{green}223/223$ $\color{green}+100.00\%$	$\color{green}9/9$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}223/223$ $\color{green}+100.00\%$

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