Phrase level shortdec is not implemented

[ToshihikoMakita]

The following DITA topic is formatted as shortdesc as block element.

<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept id="cSpaceTest">
  <title>Space test</title>
  <abstract>        Abstract <i>  text  </i>   <shortdesc>     Also contains shortdesc </shortdesc>     and     <shortdesc>multiple shortdesc can be exist in abstract</shortdesc>      text         contains trailing space!                   </abstract>
  <conbody>
    <p>  
      <i>    Italic       Text   <b>    Bold       text in &lt;i&gt; element</b> </i>   and        final      trailing    spaces                 
    </p>
    <section id="section_dnf_gdm_21b">
      <title> Section title </title> Effective text without &lt;p&gt; element (1). <p> Paragraph
        text </p> Effective text without &lt;p&gt; element (2). <p> Paragraph with fn <fn> Footnote
            <i> text </i>
        </fn> should not divided into multiple &lt;p&gt;. </p>
      <sectiondiv> Sectiondiv with fn <fn> Footnote <i> text </i>
        </fn> should not divided into multiple &lt;p&gt;. </sectiondiv>
      <p>  Paragraph with xref: <xref href="#cSpaceTest/section_dnf_gdm_21b" format="dita" type="section">  <i>XREF</i>   <b>TEXT</b>   </xref>    end Xref.   </p>
    </section>
  </conbody>
</concept>```

The result:

[mSpaceTest.docx](https://github.com/AntennaHouse/ah-wml/files/1971194/mSpaceTest.docx)

In this case shortdesc in abstract should be formatted as inline.