Fix link in coercion.rst

[hivert]

There are several dangling links in coercion.rst and action.py is missing from the reference manual.

Component: coercion

Keywords: action, Cernay2012

Author: Florent Hivert

Reviewer: Nicolas M. Thiéry

Merged: sage-5.0.beta4

Issue created by migration from https://trac.sagemath.org/ticket/11250

[hivert]

comment:1

Note: one may need #9128 to get fully functioning links.

[hivert]

Dependencies: #9128

[nthiery]

Attachment: trac_11250-action_coerce_doc-fh.patch.gz

[nthiery]

Changed dependencies from #9128 to none

[nthiery]

Reviewer: Nicolas M. Thiéry

[nthiery]

comment:2

Positive review!