Update migration guide

Signed-off-by: Louise Poubel <[email protected]>

Changelog.md

@@ -10,7 +10,7 @@
 1. Increase particle emitter quota
     * [Pull request #562](https://github.com/ignitionrobotics/ign-rendering/pull/562)
 
-1.Make sure shader param exists before setting its value
+1. Make sure shader param exists before setting its value
     * [Pull request #558](https://github.com/ignitionrobotics/ign-rendering/pull/558)
 
 1. Backport wave changes

Migration.md

@@ -5,12 +5,18 @@ Deprecated code produces compile-time warnings. These warning serve as
 notification to users that their code should be upgraded. The next major
 release will remove the deprecated code.
 
-## Ignition Rendering 6.0.1 to 6.1.0
+## Ignition Rendering 6.2.1 to 6.X
 
 ### Modifications
 
 1. Ogre 2 heightmaps: the Y position sign was flipped
 
+1. `Scene::SetTime` is often unset. Ignition's `Ogre2` now defaults to 60hz otherwise rendering won't advance forward.
+	+ Mostly affects Particles.
+	+ Also may affect gaussian postprocessing and other filters dependant on time.
+	+ Previous behavior was using real time instead of simulation time, which is wrong.
+	+ See https://github.com/ignitionrobotics/ign-rendering/issues/556 for details.
+
 ## Ignition Rendering 5.x to 6.x
 
 ### Modifications
@@ -46,12 +52,6 @@ release will remove the deprecated code.
 1. **depth_camera_fs.glsl** and **depth_camera_final_fs.glsl**
     + Far clipping changed from clipping by depth to clipping by range, i.e. distance to point, so that the data generated will never exceed the specified max range of the camera.
 
-1. `Scene::SetTime` is often unset. Ignition's `Ogre2` now defaults to 60hz otherwise rendering won't advance forward.
-	+ Mostly affects Particles.
-	+ Also may affect gaussian postprocessing and other filters dependant on time.
-	+ Previous behavior was using real time instead of simulation time, which is wrong.
-	+ See https://github.com/ignitionrobotics/ign-rendering/issues/556 for details.
-
 ## Ignition Rendering 4.0 to 4.1
 
 ## ABI break