Doctest coverage for rings

[tscrim]

Adding doctests to

• rings/complex*
• rings/homset.py
• rings/ideal.py
• rings/rational*
• rings/real*

as part of #12024 and cleaning up the documentation.

---

Apply:

• attachment: trac_13618-rings_doc_real-ts.patch
• attachment: trac_13618-rings_doc_complex-ts.patch
• attachment: trac_13618-rings_doc_others-ts.patch

Depends on #13634
Depends on #12802
Depends on #6495

CC: @kini

Component: doctest coverage

Author: Travis Scrimshaw

Reviewer: Kannappan Sampath, Volker Braun

Merged: sage-5.8.beta1

Issue created by migration from https://trac.sagemath.org/ticket/13618

[tscrim]

comment:1

The dependency on #13634 is for the output of scientific notation of complex interval field.

[tscrim]

Dependencies: #13634

[tscrim]

comment:2

If someone is willing to review this, please also review the smaller #13634. Thank you.

[tscrim]

Description changed:

--- 
+++ 
@@ -4,5 +4,6 @@
 * `rings/homset.py`
 * `rings/ideal.py`
 * `rings/rational*`
+* `rings/real*`
 
 as part of #12024 and cleaning up documentation.

[tscrim]

Changed dependencies from #13634 to #13634, #12802

[tscrim]

comment:3

Adding #12802 as a dependency since it modifies ideal.py. I will upload a rebased patch in the near future once I finish rings/real*.

[tscrim]

comment:4

Ready for review.

[tscrim]

comment:5

Removed patchbot message