Update news.md for the 3rd pyscf meeting

Author: sunqm

source/index.md

@@ -8,7 +8,7 @@ html_theme.sidebar_secondary.remove: true
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-    <a href="https://github.com/pyscf/pyscf/issues/3016">3rd PySCF Developers Meeting</a> is scheduled for **Aug 27-28, 2026, at the University of Chicago**!
+    <a href="news.html">3rd PySCF Developers Meeting</a> is scheduled for **Aug 27-28, 2026, at the University of Chicago**!
   </p>
 
 </div>

source/news.md

@@ -2,6 +2,7 @@
 
 ## 2nd PySCF Developers Meeting
 
-_18 Sep, 2024_ -- The 2nd PySCF Developers Meeting is scheduled for **Jan 13, 2025, in Pasadena, CA**.
+_Sep 18, 2024_ -- The 2nd PySCF Developers Meeting is scheduled for **Jan 13, 2025, in Pasadena, CA**.
 Please refer to the meeting [website](https://sites.google.com/view/2nd-pyscf-conference) for further details.
 
+_Oct 21, 2025_ -- The 3rd PySCF Developers Meeting is scheduled for **Aug 27-28, 2026, at the University of Chicago, IL**.