Fix broken links in 1995/vanschnitz

1995/vanschnitz/README.md

@@ -120,7 +120,7 @@ solution wherein the disks end up on peg 2; for an even
 number of disks, they will end on peg 3.  This should
 provide some hint as to what sort of algorithm is used.
 
-We have included a [spoiler](%%REPO_URL%%/1995/vanschnitz/spoiler.c) version of the program, with
+We have included a [spoiler](%%REPO_URL%%/1995/vanschnitz/vanschnitz.alt.c) version of the program, with
 meaningful symbol names and comments, but we encourage you
 to try to decipher the program without it...
 
@@ -204,7 +204,6 @@ to try to decipher the program without it...
     end
 ```
 
-
 <!--
 
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