docs: update descriptions and add structured package data for math/base/special/gcd

[gunjjoshi]

Description

What is the purpose of this pull request?

This pull request:

• adds structured package data for math/base/special/gcd.

Related Issues

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This pull request:

• resolves a part of [RFC]: support for structured package data #1147.

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No.

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@stdlib-js/reviewers

[gunjjoshi]

Here, we have different descriptions for the input and return values for JS and C implementations.
JS: https://github.com/stdlib-js/stdlib/blob/develop/lib/node_modules/%40stdlib/math/base/special/gcd/lib/main.js#L37
C: https://github.com/stdlib-js/stdlib/blob/develop/lib/node_modules/%40stdlib/math/base/special/gcd/src/main.c#L33

I have followed the JS way. But, I think a mix of both would be more appropriate, something like:

a: first number/input value
b: second number/input value
returns: greatest common divisor

Should we change this?

[kgryte]

@gunjjoshi Yes, I think you are right. Feel free to make those changes. "first number" and "second number" seems fine to me.

[gunjjoshi]

@gunjjoshi Yes, I think you are right. Feel free to make those changes. "first number" and "second number" seems fine to me.

Done! Thanks.

[kgryte]

LGTM. Thanks, @gunjjoshi!