Update migration guide

Author: Jondolf

migration-guides/0.5-to-main.md

@@ -6,12 +6,17 @@ since the latest release. These guides are evolving and may not be polished yet.
 See [migration-guides/README.md](./README.md) and existing entries for information about Avian's
 migration guide process and what to put here.
 
-## `ReadRigidBody` and `WriteRigidBody`
+## `ReadRigidBodyForces` and `WriteRigidBodyForces`
 
-PR [#908](https://github.com/avianphysics/avian/pull/908) introduced two new traits: `ReadRigidBody` and `WriteRigidBody`, and `RigidyBodyForces` is now defined as:
+PR [#908](https://github.com/avianphysics/avian/pull/908) introduced two new traits: `ReadRigidBodyForces` and `WriteRigidBodyForces`, and `RigidyBodyForces` is now defined as:
 
 ```rust
 pub trait RigidBodyForces: ReadRigidBodyForces + WriteRigidBodyForces {}
 ```
 
 In most cases this should just work, but if it doesn't, you can replace your implementation for `RigidBodyForces` with both `ReadRigidBodyForces` and `WriteRigidBodyForces` where it is used / needed. Both traits are required to implement `RigidBodyForces`, but you can implement them separately.
+
+## `SleepBody` and `WakeBody`
+
+The `SleepBody` and `WakeBody` commands now return an error when applied for an entity that doesn't exist
+or doesn't belong to an island. Previously, they logged a warning instead.