Remove redundant comment, fix typo and formatting

tinyxml2.cpp

@@ -547,8 +547,7 @@ char* XMLDocument::Identify( char* p, XMLNode** node )
         return p;
     }
 
-    // What is this thing?
-	// These strings define the matching patters:
+    // These strings define the matching patterns:
     static const char* xmlHeader		= { "<?" };
     static const char* commentHeader	= { "<!--" };
     static const char* cdataHeader		= { "<![CDATA[" };