Typo: "This table table" -> "This table is"

Noted by Nicholas Spies <ns11@voicenet.com>.

Doc/ref/ref6.tex

@@ -461,7 +461,7 @@ identifier in the list.  The form with \keyword{from} performs step
 % XXX Need to define what ``initialize'' means here
 
 The system maintains a table of modules that have been initialized,
-indexed by module name.  This table table
+indexed by module name.  This table is
 accessible as \code{sys.modules}.  When a module name is found in
 this table, step (1) is finished.  If not, a search for a module
 definition is started.  When a module is found, it is loaded.  Details