Fix another example in the Action API docs

Groups have to be a list of group dicts, not a list of strings

doc/apiv3.rst

@@ -158,7 +158,7 @@ notes                    "### About\\r\\n\\r\\nUpdated 1997."
 license_id               "cc-by"                                                ID of the license this dataset is released under. You can then look up the license ID to get the title.
 extras                   []                                      
 tags                     [{"name": "government-spending"}, {"name": "climate"}] List of tags associated with this dataset.
-groups                   ["spending", "country-uk"]                             List of groups this dataset is a member of.
+groups                   [{"name": "spending"}, {"name": "country-uk"}]         List of groups this dataset is a member of.
 relationships_as_subject []                                                     List of relationships. The 'type' of the relationship is described in terms of this package being the subject and the related package being the object.
 state                    active                                                 May be ``deleted`` or other custom states like ``pending``.
 revision_id              "f645243a-7334-44e2-b87c-64231700a9a6"                 (Read-only) ID of the last revision for the core package object was (doesn't include tags, groups, extra fields, relationships).