Rename 1995/leo/spoiler1.{md,html} to spoiler

1995/leo/README.md

@@ -217,7 +217,7 @@ if you want to pipe the output to a printer.
 `uudecode` the spoiler below if you really want to know.
 
 ```
-    begin 664 spoiler1
+    begin 664 spoiler
     M*%1H92!C;VQO;B J:7,J('1H92!S96-R970@<W=I=&-H("T@=&AE('-P86-E
     =(&)E9F]R92!I="!I<R!N;W0@82!M:7-T86ME*0II