Update docs/guides/migration_guide_vpcgw_v2.md

Co-authored-by: Rowena Jones <[email protected]>

Author: yfodil

docs/guides/migration_guide_vpcgw_v2.md

@@ -1,5 +1,5 @@
 ---
-page_title: "Migrating from Legacy VPC Gateway to v2"
+page_title: "Moving a Public Gateway from Legacy mode to IPAM mode, for v2 compatibility"
 ---
 
 # Migrating from Legacy VPC Gateway to v2