docs: add the last missing items for eo files in efl/interfaces

src/lib/efl/interfaces/efl_canvas_pointer.eo

@@ -2,6 +2,7 @@ import efl_input_device;
 
 interface Efl.Canvas.Pointer ()
 {
+   [[Efl Canvas Pointer interface]]
    methods {
       @property pointer_inside {
          get {

src/lib/efl/interfaces/efl_dup.eo

@@ -11,7 +11,7 @@ interface Efl.Dup
            The newly created object will have no event handlers or anything of
            the sort.
          ]]
-         return: Efl.Dup @owned;
+         return: Efl.Dup @owned; [[Returned carbon copy]]
       }
    }
 }

src/lib/efl/interfaces/efl_text_markup.eo

@@ -5,6 +5,7 @@ interface Efl.Text.Markup(Efl.Text.Cursor) {
    ]]
    methods {
       @property markup {
+         [[Markup property]]
          values {
             markup: string; [[The markup-text representation set to this text.]]
          }