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",

1993/ant/index.html

@@ -477,7 +477,7 @@ more information.</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/ant/ant.c">ant.c</a> - entry source code</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/ant/Makefile">Makefile</a> - entry Makefile</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/ant/ant.orig.c">ant.orig.c</a> - original source code</li>
-<li><a href="ant.txt">ant.txt</a> - ag man page</li>
+<li><a href="ant.txt">ant.txt</a> - ag man page in text format</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/ant/try.sh">try.sh</a> - script to try entry</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/ant/ant.alt.c">ant.alt.c</a> - author provided unobfuscated code</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/ant/try.alt.sh">try.alt.sh</a> - script to try unobfuscated code</li>