fix typo (extraneous ")")

Doc/tut/tut.tex

@@ -2015,7 +2015,7 @@ applied to complex expressions and nested functions:
 
 There is a way to remove an item from a list given its index instead
 of its value: the \keyword{del} statement.  This differs from the
-\method{pop()}) method which returns a value.  The \keyword{del}
+\method{pop()} method which returns a value.  The \keyword{del}
 statement can also be used to remove slices from a list or clear the
 entire list (which we did earlier by assignment of an empty list to
 the slice).  For example: