doc: Remove tup from the list of keywords

Author: pcwalton

doc/rust.texi

@@ -652,33 +652,32 @@ The keywords are:
 @tab @code{i32}
 @tab @code{i64}
 @tab @code{f64}
-@item @code{tup}
-@tab @code{tag}
+@item @code{tag}
 @tab @code{vec}
 @tab @code{str}
 @tab @code{with}
-@item @code{fn}
-@tab @code{iter}
+@tab @code{fn}
+@item @code{iter}
 @tab @code{pure}
 @tab @code{obj}
 @tab @code{resource}
-@item @code{if}
-@tab @code{else}
+@tab @code{if}
+@item @code{else}
 @tab @code{alt}
 @tab @code{case}
 @tab @code{in}
-@item @code{do}
-@tab @code{while}
+@tab @code{do}
+@item @code{while}
 @tab @code{break}
 @tab @code{cont}
 @tab @code{note}
-@item @code{assert}
-@tab @code{claim}
+@tab @code{assert}
+@item @code{claim}
 @tab @code{check}
 @tab @code{prove}
 @tab @code{fail}
-@item @code{for}
-@tab @code{each}
+@tab @code{for}
+@item @code{each}
 @tab @code{ret}
 @tab @code{put}
 @tab @code{be}