PR: Transform linear algebra functions extension md to rst

[steff456]

This PR transforms the linear algebra functions extension page from markdown to rst

Ref: #283

[asmeurer]

Autosummary failed in the build. I'm not clear why.

[asmeurer]

Is it possible to name the file just linalg.py and have the function show up as linalg.cholesky, linalg.cross, and so on?

[asmeurer]

The build passes for me locally.

[steff456]

Autosummary failed in the build. I'm not clear why.

I think there's something weird with the python version, but I already fixed it on another PR. So once that's merged I hope the CIs are fixed here.

Is it possible to name the file just linalg.py and have the function show up as linalg.cholesky, linalg.cross, and so on?

Sure, I can change the name of the module

[asmeurer]

Which other PR?

I'd like to get this merged as there as some fixed I want to make the linalg spec.

[steff456]

Which other PR?

#367

[asmeurer]

Everything looks good except for those comments.

[kgryte]

@steff456 I believe #367 has already been merged. Are you able to resolve the merge conflict?