Tweak intro page

Update online help link to point to zaproxy site.
Remove unnecessary paragraph and line break at the end of the page.

Signed-off-by: thc202 <[email protected]>

Author: thc202

addOns/help/src/main/javahelp/contents/intro.html

@@ -12,7 +12,7 @@ <H1>
 <p>
 Welcome to the The OWASP Zed Attack Proxy (ZAP) Desktop User Guide.<br/><br/>
 This is available both as context sensitive help within ZAP and online at 
-https://github.com/zaproxy/zap-core-help/wiki/HelpIntro
+https://www.zaproxy.org/docs/desktop/
 <p>
 ZAP is an easy to use integrated penetration testing tool for finding vulnerabilities in web applications. 
 <p>
@@ -47,7 +47,6 @@ <H2>External links</H2>
 <tr><td>&nbsp;&nbsp;&nbsp;&nbsp;</td><td><a href="https://www.owasp.org/index.php/ZAP">ZAP homepage</a></td></tr>
 <tr><td>&nbsp;&nbsp;&nbsp;&nbsp;</td><td><a href="https://en.wikipedia.org/wiki/Proxy_server">Wikipedia entry for proxies</a></td></tr>
 </table>
-<br/>
-<p>
+
 </BODY>
 </HTML>