Update 1993 winning entries' README.md files

Format and typo fixes. Starting with this year I actually did more
thorough typo fixes. It might be that I did some of this in earlier
years too but I am sure I did it for this year and beyond (at least up
through 1995 .. not sure about years beyond that that I have also
edited). Even so I'll probably want to do another pass through all files
before I can say that the typo issue is resolved. That includes possibly
other files and the worst of all files in my entries.

1993/leo/Makefile

@@ -114,14 +114,14 @@ DATA=
 TARGET= ${PROG}
 #
 ALT_OBJ=
-ALT_TARGET=
+ALT_TARGET= mind
 
 
 #################
 # build the entry
 #################
 #
-all: data ${TARGET}
+all: data ${TARGET} ${ALT_TARGET}
 	@${TRUE}
 
 .PHONY: all alt data everything clean clobber install \