OO-1364: fix some HTML validation errors

src/main/java/org/olat/core/commons/services/commentAndRating/ui/_content/userComments.html

 <div class="o_block">
 	#if(($commentControllers.size() > 0) && $r.available("createCommentFormCtr"))
 		<div class="o_block">
-			<a id="o_comment_form_link" class="onclick="{o_scrollToElement('#o_comment_form'); return false;}" href="#o_comment_form">
+			<a id="o_comment_form_link" onclick="{o_scrollToElement('#o_comment_form'); return false;}" href="#o_comment_form">
 				$r.translate("comments.create.goto") <i class="o_icon o_icon_start"></i>
 			</a>
 		</div>

src/main/java/org/olat/gui/control/HelpUserTool.java

@@ -52,7 +52,7 @@ public class HelpUserTool implements UserTool, ComponentEventListener {
 		Link helpLink = LinkFactory.createLink("topnav.help", container, this);
 		helpLink.setIconLeftCSS("o_icon o_icon_help o_icon-lg");
 		helpLink.setTooltip("topnav.help.alt");
-		helpLink.setTarget("_oohelp");
+		helpLink.setTarget("oohelp");
 		return helpLink;
 	}
 

src/main/java/org/olat/gui/control/OlatGuestTopNavController.java

@@ -77,7 +77,7 @@ public class OlatGuestTopNavController extends BasicController {
 			helpLink = LinkFactory.createLink("topnav.help", vc, this);
 			helpLink.setIconLeftCSS("o_icon o_icon_help o_icon-lg");
 			helpLink.setTooltip("topnav.help.alt");
-			helpLink.setTarget("_oohelp");
+			helpLink.setTarget("oohelp");
 		}
 		
 		loginLink = LinkFactory.createLink("topnav.login", vc, this);