doc(crd-generator): add mention of v2 CRD generator API to migration …

…guide

doc/MIGRATION-v7.md

@@ -316,5 +316,6 @@ We are no longer supporting it.
 ### CRD Generator annotation processor deprecated <a href="#crd-generator-annotation-processor-deprecated" id="crd-generator-annotation-processor-deprecated"/>
 
 The CRD Generator annotation processing tool (APT) (`io.fabric8:crd-generator-apt`) and its API (`io.fabric8:crd-generator-api`) are being deprecated and will eventually be removed once we offer a complete replacement for all users.
+The CRD Generator API users should use the v2 version of the API ((`io.fabric8:crd-generator-api-v2`) instead. 
 
 You can find out more about its replacement in the [CRD Generator documentation](./CRD-generator.md)