Update error info for require (#4362)

language/control-structures/require.xml

@@ -7,10 +7,10 @@
 
  <para>
   <literal>require</literal> is identical to <function>include</function>
-  except upon failure it will also produce a fatal <constant>E_COMPILE_ERROR</constant>
-  level error. In other words, it will halt the script whereas
-  <function>include</function> only emits a warning 
-  (<constant>E_WARNING</constant>) which allows the script to continue.
+  except upon failure it will also produce an <classname>Error</classname>
+  exception (<constant>E_COMPILE_ERROR</constant> level error prior to
+  PHP 8.0.0) whereas <function>include</function> will only produce a warning
+  (<constant>E_WARNING</constant> level error).
  </para>
  <para>
   See the <function>include</function> documentation for how this works.