include_once is not a statement but an expression (GH-3790)

Author: takaram

language/control-structures/include-once.xml

@@ -5,9 +5,9 @@
  <title>include_once</title>
  <?phpdoc print-version-for="include_once"?>
  <para>
-  The <literal>include_once</literal> statement includes and evaluates
+  The <literal>include_once</literal> expression includes and evaluates
   the specified file during the execution of the script.
-  This is a behavior similar to the <function>include</function> statement,
+  This is a behavior similar to the <function>include</function> expression,
   with the only difference being that if the code from a file has already
   been included, it will not be included again, and include_once returns &true;.  As the name suggests,
   the file will be included just once.