Streamline the warning about self-closing-tag syntax (#75)

Author: sideshowbarker

src/nu/validator/htmlparser/impl/TreeBuilder.java

@@ -2889,13 +2889,8 @@ public final void startTag(ElementName elementName,
         } else if (wasSelfClosing && voidElement
                 && tokenizer.getErrorProfile() != null
                 && tokenizer.getErrorProfile().get("html-strict") != null) {
-            warn("Self-closing tag syntax in text/html documents is widely"
-                    + " discouraged; it’s unnecessary and interacts badly"
-                    + " with other HTML features (e.g., unquoted attribute"
-                    + " values). If you’re using a tool that injects"
-                    + " self-closing tag syntax into all void elements,"
-                    + " without any option to prevent it from doing so,"
-                    + " then consider switching to a different tool.");
+            warn("Trailing slash on void elements has no effect and interacts"
+                    + " badly with unquoted attribute values.");
         // ]NOCPP]
         }
         // CPPONLY: if (mBuilder == null && attributes != HtmlAttributes.EMPTY_ATTRIBUTES) {