Documentation: remaining PHP "var" declarations changed to "public"

Since PHP 4 isn't supported anymore, let's clean up these few
PHP "var" declarations which were remaining in the documentation.

According to my checks, there is no more PHP "var" left.
diff --git a/user_guide_src/source/database/query_builder.rst b/user_guide_src/source/database/query_builder.rst
index 54e8df6..b86a0c8 100644
--- a/user_guide_src/source/database/query_builder.rst
+++ b/user_guide_src/source/database/query_builder.rst
@@ -603,9 +603,9 @@
 
 	/*
 	class Myclass {
-		var  $title = 'My Title';
-		var  $content = 'My Content';
-		var  $date = 'My Date';
+		public $title = 'My Title';
+		public $content = 'My Content';
+		public $date = 'My Date';
 	}
 	*/
 
@@ -730,9 +730,9 @@
 
 	/*
 	class Myclass {
-		var  $title = 'My Title';
-		var  $content = 'My Content';
-		var  $date = 'My Date';
+		public $title = 'My Title';
+		public $content = 'My Content';
+		public $date = 'My Date';
 	}
 	*/
 
@@ -766,9 +766,9 @@
 
 	/*
 	class Myclass {
-		var  $title = 'My Title';
-		var  $content = 'My Content';
-		var  $date = 'My Date';
+		public $title = 'My Title';
+		public $content = 'My Content';
+		public $date = 'My Date';
 	}
 	*/