Manifest updates for 1993/ant and 2020/endoh2

For 1993/ant it clarifies (even though the extension of the file
probably would suggest it) that the man page is in text format.

For 2020/endoh2 there were some mistakes introduced with the renaming of
spoiler to other things.

Rebuilt the .entry.json and the index.html files for both.

Rebuilt 2020/endoh2/obfuscation/index.html.

1993/ant/.entry.json

@@ -39,7 +39,7 @@
 	    "OK_to_edit" : true,
 	    "display_as" : "text",
 	    "display_via_github" : false,
-	    "entry_text" : "ag man page"
+	    "entry_text" : "ag man page in text format"
 	},
 	{
 	    "file_path" : "try.sh",