update use of chkentry to use new arg order

The `chkentry(1)` tool was changed so that the `.auth.json`
arg comes before the `.info.json` arg.  These changes are
needed to accommodate and document that change.

Also the use of the single arg as a directory was
removed from documentation (until issue #940 is addressed).

sitemap.xml

@@ -15210,7 +15210,7 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/bin/cvt-submission.sh</loc>
-    <lastmod>2025-01-10T06:06:40+00:00</lastmod>
+    <lastmod>2025-01-18T20:11:54+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/bin/entry2csv.sh</loc>
@@ -15414,11 +15414,11 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/faq.html</loc>
-    <lastmod>2025-01-18T16:34:05+00:00</lastmod>
+    <lastmod>2025-01-18T20:15:51+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/faq.md</loc>
-    <lastmod>2025-01-18T16:33:38+00:00</lastmod>
+    <lastmod>2025-01-18T20:13:22+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/inc/index.html</loc>