Better format longest-length comments.

10-accumulators/dq01-longest-length-tr.rkt

@@ -28,7 +28,6 @@
                          (longest-length (cdr los) max-len-so-far)))]))]
     (longest-length los0 0)))
 
-;
 ;
 ; `longest-length` is tail-recursive because we return from either the `if` or
 ; the `else` clauses directly by recursively calling `longest-length`.  The