docs: fix method invocation in example

[ShabiShett07]

none

Description

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This pull request:

• change dgemv to dgemv.ndarray in ndarray function call

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• none

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Coverage Report

Package	Statements	Branches	Functions	Lines
blas/base/dgemv	$\color{red}748/749$ $\color{green}+99.87\%$	$\color{red}116/117$ $\color{green}+99.15\%$	$\color{green}6/6$ $\color{green}+100.00\%$	$\color{red}748/749$ $\color{green}+99.87\%$

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

[kgryte]

Thanks for fixing! LGTM.