docs: ector_software: fill gaps in ector software backend eo file documentation

src/lib/ector/software/ector_renderer_software.eo

@@ -1,9 +1,11 @@
 class Ector.Renderer.Software (Ector.Renderer)
 {
+   [[Ector software renderer class]]
    data: null;
    methods {
       fill @virtual_pure {
-         return: bool;
+      	 [[Renderer fill operation]]
+         return: bool; [[$true on success, $false otherwise]]
       }
    }
 }

src/lib/ector/software/ector_renderer_software_buffer.eo

@@ -1,11 +1,13 @@
 class Ector.Renderer.Software.Buffer (Ector.Renderer.Software, Ector.Renderer.Buffer)
 {
+   [[Ecto software renderer buffer class]]
    methods {
       @property buffer {
+      	 [[Buffer property]]
          set {}
          get {}
          values {
-            buf: Ector.Buffer;
+            buf: Ector.Buffer; [[Buffer]]
          }
       }
    }

src/lib/ector/software/ector_renderer_software_gradient_linear.eo

@@ -1,5 +1,6 @@
 class Ector.Renderer.Software.Gradient.Linear (Ector.Renderer.Software, Ector.Renderer.Gradient, Ector.Renderer.Gradient.Linear)
 {
+   [[Ector software renderer gradient linear class]]
    eo_prefix: ector_renderer_software_gradient_linear;
    data: Ector_Renderer_Software_Gradient_Data;
    implements {

src/lib/ector/software/ector_renderer_software_gradient_radial.eo

@@ -1,5 +1,6 @@
 class Ector.Renderer.Software.Gradient.Radial (Ector.Renderer.Software, Ector.Renderer.Gradient, Ector.Renderer.Gradient.Radial)
 {
+   [[Ector software renderer gradient radial]]
    eo_prefix: ector_renderer_software_gradient_radial;
    data: Ector_Renderer_Software_Gradient_Data;
    implements {

src/lib/ector/software/ector_renderer_software_shape.eo

@@ -1,5 +1,6 @@
 class Ector.Renderer.Software.Shape (Ector.Renderer.Software, Ector.Renderer.Shape)
 {
+   [[Ector software renderer shape class]]
    eo_prefix: ector_renderer_software_shape;
    implements {
       Ector.Renderer.prepare;

src/lib/ector/software/ector_software_buffer.eo

@@ -1,5 +1,6 @@
 class Ector.Software.Buffer (Efl.Object, Ector.Software.Buffer.Base)
 {
+   [[Ector software buffer class]]
    data: null;
    implements {
       Efl.Object.constructor;

src/lib/ector/software/ector_software_surface.eo

@@ -1,5 +1,6 @@
 class Ector.Software.Surface (Ector.Software.Buffer, Ector.Surface)
 {
+   [[Ector surface software class]]
    eo_prefix: ector_software_surface;
    methods {}
    implements {