doc: Fix since marker in dmabuf to match a stable release
diff --git a/gst-libs/gst/allocators/gstdmabuf.h b/gst-libs/gst/allocators/gstdmabuf.h
index 9410f65..364067f 100644
--- a/gst-libs/gst/allocators/gstdmabuf.h
+++ b/gst-libs/gst/allocators/gstdmabuf.h
@@ -54,7 +54,7 @@
  * In this case the importer element should check all incomming memory using
  * gst_is_dmabuf_memory().
  *
- * Since: 1.11
+ * Since: 1.12
  */
 #define GST_CAPS_FEATURE_MEMORY_DMABUF "memory:DMABuf"