db: added note for SQL Server

collects/db/scribblings/db.scrbl

@@ -35,6 +35,7 @@ library's ODBC support (see @secref["odbc-status"] for details):
 @itemlist[
 @item{@bold{@as-index{@hyperlink["http://www.oracle.com"]{Oracle}}}}
 @item{@bold{@as-index{@hyperlink["http://www.ibm.com/software/data/db2/"]{DB2}}}}
+@item{@bold{@as-index{@hyperlink["http://www.microsoft.com/sqlserver/"]{SQL Server}}}}
 ]}
 ]
 

collects/db/scribblings/notes.scrbl

@@ -182,3 +182,8 @@ Maybe Oracle bug? See:
   http://stackoverflow.com/questions/38435/
   http://forums.oracle.com/forums/thread.jspa?threadID=856713
 }
+
+@subsection{SQL Server ODBC Driver}
+
+Basic SQL Server support has been verified on @bold{win32}, but the
+automated test suite has not yet been adapted and run.