Updated platforms supported (deleted Solaris 2.5.1).

security/psm/doc/release_notes.html

@@ -103,7 +103,7 @@ installing Netscape 6 (or PSM for Mozilla), and vice versa.</li>
 <a NAME="Software/Hardware Requirements"></a><font size=+2>Software/Hardware
 Requirements</font></h4>
 <b>Operating systems supported:</b> Windows NT, Windows 95, Windows 98;
-Solaris 2.5.1, 2.6, 7; and Linux 2.1 and 2.2.
+Solaris 2.6, 2.7; and Linux 2.1 and 2.2.
 <p><b>Other software requirements:</b>
 <blockquote>
 <li>