tdf#161347 Harmonise API docs for UserDefinedAttributes a bit

Change-Id: I85ce6e42d292b85ca0a54652dd733b14137afe9d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/172033
Tested-by: Jenkins
Tested-by: Ilmari Lauhakangas <ilmari.lauhakangas@libreoffice.org>
Reviewed-by: Ilmari Lauhakangas <ilmari.lauhakangas@libreoffice.org>

offapi/com/sun/star/frame/XFrame2.idl

@@ -26,6 +26,8 @@ module com {  module sun {  module star {  module frame {
 published interface XFrame2
 {
     /** contains user defined attributes.
+
+        @see com::sun::star::xml::AttributeContainer
      */
     [attribute, readonly] com::sun::star::container::XNameContainer UserDefinedAttributes;
 

offapi/com/sun/star/style/PageProperties.idl

@@ -148,9 +148,7 @@ published service PageProperties
 
     /** contains user defined attributes.
 
-        <p>This com::sun::star::container::XNameContainer
-        supports the service
-        com::sun::star::xml::AttributeContainer.</p>
+        @see com::sun::star::xml::AttributeContainer
      */
     [property] com::sun::star::container::XNameContainer UserDefinedAttributes;
 

offapi/com/sun/star/table/CellProperties.idl

@@ -166,6 +166,8 @@ published service CellProperties
 
         <p>This property is used i.e. by the XML filters to load and
         restore unknown attributes.</p>
+
+        @see com::sun::star::xml::AttributeContainer
      */
     [optional, property] com::sun::star::container::XNameContainer
         UserDefinedAttributes;