fixed failure in docs/dev/action_parameters.rst
fixed failure in docs/dev/action_parameters.rst

lino-framework/lino,lsaffre/lino,lsaffre/lino,lino-framework/lino,lsaffre/lino,lino-framework/lino,lsaffre/lino,lino-framework/lino,lsaffre/lino,lino-framework/lino