Document "without default imports" option for @property-bootstrap

doc/specifying-properties.tex

@@ -54,6 +54,9 @@ Some imports are included automatically and do not need to be added here:
 	\item The tested module itself.
 \end{itemize}
 
+To prevent these modules from being imported, add \clean{without default imports} on the same line as \clean{@property-bootstrap}.
+With this option, no modules are imported by default whatsoever.
+
 \subsection{Advanced properties}
 
 \subsubsection{\clean{@invariant}}