docs: update return annotations to use ndarray instance notation for stats/max-by

[iampratik13]

Resolves None

Description

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This pull request:

docs: update return annotations to use ndarray instance notation for stats/max-by

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{{TODO: add disclosure if applicable}}

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@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/max-by	$\color{green}161/161$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}0/0$ $\color{green}+0.00%$	$\color{green}161/161$ $\color{green}+0.00%$

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

[kgryte]

LGTM