Add FloatingIPPoolRef to crd-chagnes for v1beta1

Author: huxcrux

docs/book/src/topics/crd-changes/v1alpha7-to-v1beta1.md

@@ -12,6 +12,7 @@
       - [Removal of cloudName](#removal-of-cloudname)
       - [Change to serverGroupID](#change-to-servergroupid)
       - [Changes to ports](#changes-to-ports)
+      - [Additon of floatingIPPoolRef](#additon-of-floatingippoolref)
     - [`OpenStackCluster`](#openstackcluster)
       - [Removal of cloudName](#removal-of-cloudname-1)
       - [identityRef is now required](#identityref-is-now-required)
@@ -96,6 +97,23 @@ Setting either of the following fields explicitly to the empty string would prev
 * nameSuffix
 * description
 
+#### Additon of floatingIPPoolRef
+
+A new field, FloatingIPPoolRef, has been introduced. It is important to note that this feature requires the existence of an IPPool to operate seamlessly. This new field references an IPPool whice will be used for floating IP allocation.
+In additon to this field an IPPool resource called `OpenStackFloatingIPPool` has been added. Please not that this resource is new and still in alpha meaning its more likely to contain bugs and change in the future.
+
+When creating an OpenStackFloatingIPPool resource named MyOpenStackFloatingIPPool, you can reference it within your OpenStackMachine configuration YAML as follows:
+
+```yaml
+spec:
+  template:
+    spec:
+      floatingAddressFromPool:
+        apiGroup: "infrastructure.cluster.x-k8s.io"
+        kind: "OpenStackFloatingIPPool"
+        name: "MyOpenStackFloatingIPPool"
+```
+
 ### `OpenStackCluster`
 
 #### Removal of cloudName