Add doctest directory to the reference manual

[jdemeyer]

Depends on #14370

CC: @jhpalmieri @roed314

Component: documentation

Author: John Palmieri

Reviewer: Jeroen Demeyer

Merged: sage-5.9.beta3

Issue created by migration from https://trac.sagemath.org/ticket/14376

[jhpalmieri]

comment:1

Here's an initial patch.

[jhpalmieri]

Author: John Palmieri

[jhpalmieri]

Dependencies: #14370

[jdemeyer]

comment:3

Attachment: trac_14376.patch.gz

Your patch actually breaks doctesting sage/doctest/forker.py because of line number changes.

[jdemeyer]

Reviewer: Jeroen Demeyer

[jhpalmieri]

comment:4

The patch from 16 hours ago failed doctesting, but the one from 11 hours ago fixed those line numbers, at least for me. Can you make sure you used the right patch?