doc: Remove case from the list of keywords

Author: pcwalton

doc/rust.texi

@@ -664,21 +664,20 @@ The keywords are:
 @tab @code{if}
 @item @code{else}
 @tab @code{alt}
-@tab @code{case}
 @tab @code{in}
 @tab @code{do}
-@item @code{while}
-@tab @code{break}
+@tab @code{while}
+@item @code{break}
 @tab @code{cont}
 @tab @code{note}
 @tab @code{assert}
-@item @code{claim}
-@tab @code{check}
+@tab @code{claim}
+@item @code{check}
 @tab @code{prove}
 @tab @code{fail}
 @tab @code{for}
-@item @code{each}
-@tab @code{ret}
+@tab @code{each}
+@item @code{ret}
 @tab @code{put}
 @tab @code{be}
 @end multitable