Document the new get_syntax() function.

Doc/lib/libregex.tex

@@ -228,6 +228,10 @@ expressions.)
   more information.
 \end{funcdesc}
 
+\begin{funcdesc}{get_syntax}{}
+  Returns the current value of the syntax flags as an integer.
+\end{funcdesc}
+
 \begin{funcdesc}{symcomp}{pattern\optional{\, translate}}
 This is like \code{compile}, but supports symbolic group names: if a
 parenthesis-enclosed group begins with a group name in angular

Doc/libregex.tex

@@ -228,6 +228,10 @@ expressions.)
   more information.
 \end{funcdesc}
 
+\begin{funcdesc}{get_syntax}{}
+  Returns the current value of the syntax flags as an integer.
+\end{funcdesc}
+
 \begin{funcdesc}{symcomp}{pattern\optional{\, translate}}
 This is like \code{compile}, but supports symbolic group names: if a
 parenthesis-enclosed group begins with a group name in angular