docs/vulns: cleanup the vulnerability display per version

docs/_singlevuln.templ

@@ -15,11 +15,14 @@ WHERE3(Docs, "/docs/", Vulnerability table, "/docs/vulnerabilities.html", %versi
 TITLE(Vulnerabilities in curl %version)
 #include "adv-related-box.inc"
 
-<p> curl version <b>%version</b> was released on <b>%date</b>. The following
-<b>%vulnnum</b> security problem%vulnplural known to exist in this version.
+<p> curl version <b>%version</b> was released on <b>%date</b>
+
+<p> It has the following <b>%vulnnum</b> published security problem%vulnplural.
 
 %vulnerabilities
 
+SUBTITLE(Futher details)
+
 <p>
  CVE data for %version provided as <a href="vuln-%version.json">JSON</a>.
 

docs/vulntable.pl

@@ -83,7 +83,7 @@ sub single {
     }
     else {
         # nothing known - yet
-        $vulnhtml = "<p> <big>Yay - there are no published security vulnerabilities for this version!</big>";
+        $vulnhtml = "<p> <strong>There are no published security vulnerabilities for this version.</strong>";
     }
 
     my $n = "<p>  See vulnerability summary for ";
@@ -103,10 +103,10 @@ sub single {
     $anchor =~ s/\./_/g;
 
     if($vulnnum == 1) {
-      $vulnplural = ' is';
+        $vulnplural = "";
     }
     else {
-      $vulnplural = 's are';
+        $vulnplural = "s";
     }
 
     open(T, "<_singlevuln.templ");