update fallback versionadded

Author: jmckenna

en/mapfile/class.txt

@@ -7,8 +7,6 @@
  CLASS
 *****************************************************************************
 
-:Last Updated: 2025-08-18
-
 .. index:: 
    pair: CLASS; BACKGROUNDCOLOR
    :name: mapfile-class-backgroundcolor
@@ -97,11 +95,12 @@ EXPRESSION [string]
    :name: mapfile-class-fallback
 
 FALLBACK [true|false]
+    .. versionadded:: 8.6
+
     Specifies whether the class should act as a fallback class. Default is false.
     A fallback class is applied if and only if none of the previously
     defined classes has been applied. This is similar in concept to
     the :ref:`sld` ElseFilter.
-   .. versionadded:: 8.6
 
 .. index::
    pair: CLASS; GROUP