Drop some leftover 2.xx comments from gnome/pluma

xed/xed-document.c

@@ -549,8 +549,6 @@ xed_document_class_init (XedDocumentClass *klass)
      * @create: whether the document should be created if it doesn't exist.
      *
      * The "load" signal is emitted when a document is loaded.
-     *
-     * Since: 2.22
      */
     document_signals[LOAD] =
         g_signal_new ("load",
@@ -600,8 +598,6 @@ xed_document_class_init (XedDocumentClass *klass)
      * @flags: the #XedDocumentSaveFlags for the save operation.
      *
      * The "save" signal is emitted when the document is saved.
-     *
-     * Since: 2.20
      */
     document_signals[SAVE] =
         g_signal_new ("save",

xed/xed-message-bus.c

@@ -88,9 +88,6 @@
  *                         NULL);
  * </programlisting>
  * </example>
- *
- * Since: 2.25.3
- *
  */
 
 #define XED_MESSAGE_BUS_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE((object), XED_TYPE_MESSAGE_BUS, XedMessageBusPrivate))

xed/xed-message-type.c

@@ -33,9 +33,6 @@
  *                                                         NULL);
  * </programlisting>
  * </example>
- *
- * Since: 2.25.3
- *
  */
 typedef struct
 {

xed/xed-message.c

@@ -17,9 +17,6 @@
  * A message can be seen as a method call, or signal emission depending on
  * who is the sender and who is the receiver. There is no explicit distinction
  * between methods and signals.
- *
- * Since: 2.25.3
- *
  */
 #define XED_MESSAGE_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE((object), XED_TYPE_MESSAGE, XedMessagePrivate))