No brief description in detailed output for members if there is no detailed description

[DmitriyMarin]

Hi! Thanks for the great package!

There is a possible copy/paste issue: if a member function, macros, etc. have a brief description done in doxygen but no detailed description then no brief description is added to the detailed output done using templates/memDef.jinja2 because the has function of the Brief class in Prperty checks for "detaileddescription" in XML instead of "briefdescription":

    class Brief:
        #...
        def has(self) -> bool:
            detaileddescription = self.xml.find("detaileddescription")
            return len(list(detaileddescription)) > 0

This can be overcome by customizing the memDef.jinja2 template by omitting the node.has_brief check, i.e. going from:

{% if configMemDef.get('brief') -%}
{% if node.has_brief -%}
{{node.brief + "\n"}}
{%- endif -%}
{%- endif -%}

to

{% if configMemDef.get('brief') -%}
{{node.brief + "\n"}}
{%- endif -%}