Update link to the eclipse online documentation

Signed-off-by: Krum Tsvetkov <krum.tsvetkov@sap.com>
diff --git a/documentation/_index.html b/documentation/_index.html
index 27d48ed..7649cc0 100644
--- a/documentation/_index.html
+++ b/documentation/_index.html
@@ -1,7 +1,7 @@
 <ul>

 <!--	<li><b><a href="http://wiki.eclipse.org/MemoryAnalyzer"

 		title="Getting started">Getting Started</a></b></li> -->

-	<li><b><a href="http://help.eclipse.org/neon/index.jsp?topic=/org.eclipse.mat.ui.help/welcome.html"

+	<li><b><a href="http://help.eclipse.org/index.jsp?topic=/org.eclipse.mat.ui.help/welcome.html"

 		title="Documentation">Documentation</a></b> - online version of the documentation available also from within the tool</li>

 	<li><b><a href="https://wiki.eclipse.org/MemoryAnalyzer/Learning_Material"

 		title="Learning">Learning</a></b> - learn from presentations, blogs, tutorials</li>