Graphviz Extension: graphviz_dot option is not replaced by layout for graph and digraph directives

[loebl]

Describe the bug
A clear and concise description of what the bug is.

When adding the new layout option to class Graphviz, it was forgotten to add it to GraphvizSimple. This way the documentation and code/behaviour are not consistent

To Reproduce

Compare:

• sphinx/sphinx/ext/graphviz.py

  Line 121 in 68c91b1

  'graphviz_dot': directives.unchanged, # an old alias of `layout` option

• sphinx/sphinx/ext/graphviz.py

  Line 185 in 68c91b1

  'graphviz_dot': directives.unchanged,

  
  As well as:

• sphinx/sphinx/ext/graphviz.py

  Line 156 in 68c91b1

  node['options']['graphviz_dot'] = self.options['layout']

• sphinx/sphinx/ext/graphviz.py

  Line 196 in 68c91b1

  node['options']['graphviz_dot'] = self.options['graphviz_dot']

Expected behavior
Option listing (and processing) should be identical

Your project

Mini-Example:

.. works

.. graphviz::
   :layout: neato

   graph foobar {
   foo -- bar;
   bar -- baz;
   baz -- foo;
   }

.. doesn't work

.. graph::
   :layout: neato

   foo -- bar;
   bar -- baz;
   baz -- foo;

EDIT: corrected graph directive in example

Screenshots
none

Environment info

• OS: Debian 10 (Buster), Sphinx inside virtualenv
• Python version: 3.7.3
• Sphinx version: 3.2.1
• Sphinx extensions: sphinx.ext.graphviz, sphinx_rtd_theme
• Extra tools: firefox 78.5.0

Additional context
None

[loebl]

👍
Thanks

[tk0miya]

Fixed. Thank you for reporting!