Fix typo.

Doc/tut/tut.tex

@@ -2024,7 +2024,7 @@ instance:
 ((12345, 54321, 'hello!'), (1, 2, 3, 4, 5))
 \end{verbatim}
 
-As you see, on output tuples are alway enclosed in parentheses, so
+As you see, on output tuples are always enclosed in parentheses, so
 that nested tuples are interpreted correctly; they may be input with
 or without surrounding parentheses, although often parentheses are
 necessary anyway (if the tuple is part of a larger expression).