Update release notes

Author: beutlich

Modelica/Resources/ReleaseNotes/Modelica.UsersGuide.ReleaseNotes.Version_4_0_0.html

@@ -17,7 +17,7 @@ <h2><a id="info" name="info">Information</a></h2>
 new version. Short Overview:</p>
 <ul>
 <li>About <a href="../Documentation/Version-4.0.0/ResolvedGitHubIssues.html">
-643 issues (including 427 pull requests)</a> have been addressed
+647 issues (including 431 pull requests)</a> have been addressed
 for this release.</li>
 <li>This version is based on the recent Modelica language standard
 version 3.4.</li>