The short description for the document as specified by the user in the wizard.
The short description is a description for the document provided by the user in the blueprint wizard. Typically this description has about one too three sentences and does not use markup. But markup is not strictly forbidden.
Access the variable value like this:
<at:var at:name="projectdoc.doctype.common.shortDescription" at:rawxhtml="true"/>
Use rawxml="true" since the content of the variable may contain HTML markup.