docs: update links in fft/base/fftpack/generic/rfftf

[gunjjoshi]

Resolves None.

Description

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This pull request:

• updates README.md to use correct path to upcoming rfftb package.

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@stdlib-js/reviewers

[gunjjoshi]

Although we still do not have the rfftb package, but updating this now so that we don't miss this later once we have implemented rfftb.

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
fft/base/fftpack/generic/rfftf	$\\color{red}2788/2880$ $\\color{green}+96.81\\%$	$\\color{red}126/137$ $\\color{green}+91.97\\%$	$\\color{green}18/18$ $\\color{green}+100.00\\%$	$\\color{red}2788/2880$ $\\color{green}+96.81\\%$

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