Change migration assumptions about IPFS (#363)

migration ipfs assumption change

Author: incrypto32

website/pages/en/cookbook/migrating-a-subgraph.mdx

@@ -12,7 +12,8 @@ The process of migration is quick and your subgraphs will forever benefit from t
 
 - You have already deployed a subgraph on the hosted service.
 - The subgraph is indexing a chain available (or available in beta) on The Graph Network.
-- The subgraph does not have IPFS or full-text search dependencies (these are not fully supported on the decentralized network yet).
+- The subgraph does not use `ipfs.cat` in handler functions.
+- The subgraph does not have full-text search dependencies (it is not fully supported on the decentralized network yet).
 
 ## Migrating an Existing Subgraph to The Graph Network