Add a doctest for closed ticket #8005

[orlitzky]

The issue from #8005 was fixed by another ticket, #9138. I've added a doctest for it and cleaned up a little.

Component: algebra

Author: Michael Orlitzky

Branch/Commit: 7232cd5

Reviewer: Jeroen Demeyer

Issue created by migration from https://trac.sagemath.org/ticket/17244

[orlitzky]

Commit: 7232cd5

[orlitzky]

Branch: u/mjo/ticket/17244

[orlitzky]

New commits:

7232cd5

Trac #17244: Add a doctest for the example on trac #8005.

[jdemeyer]

comment:2

Normally there should be spaces around the = like

R.<x,y> = F[]

but positive review anyway.

[jdemeyer]

Reviewer: Jeroen Demeyer

[orlitzky]

comment:3

Replying to @jdemeyer:

Normally there should be spaces around the = like

R.<x,y> = F[]

but positive review anyway.

Ah, I copy/pasted from the description in #8005 and didn't catch it, sorry. Thanks for the review.

[vbraun]

Changed branch from u/mjo/ticket/17244 to 7232cd5