chore: fix JavaScript lint errors (issue #11327)

[bhumikasudarshani-cmd]

Related Issues

resolves #11327

Description

Fixed two lint errors:
-->Corrected JSDoc return value from 8t to 8Z in @stdlib/error/tools/msg2id
--> Replaced => with // returns marker in @stdlib/math/base/special/roundb test file

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[GeoDaoyu]

The return value is a string.

[kgryte]

/stdlib merge

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Coverage Report

Package	Statements	Branches	Functions	Lines
error/tools/msg2id	$\color{green}106/106$ $\color{green}+100.00%$	$\color{green}10/10$ $\color{green}+100.00%$	$\color{green}1/1$ $\color{green}+100.00%$	$\color{green}106/106$ $\color{green}+100.00%$
math/base/special/roundb	$\color{green}203/203$ $\color{green}+100.00%$	$\color{green}24/24$ $\color{green}+100.00%$	$\color{green}2/2$ $\color{green}+100.00%$	$\color{green}203/203$ $\color{green}+100.00%$

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