updating api-interface's README

tee-worker/omni-executor/parentchain/api-interface/README.md

@@ -6,13 +6,18 @@ This crate contains auto-generated Substrate runtime API definitions for the Omn
 
 The crate exports the generated interface from a scale encoded metadata file. The interface is used to interact with the parentchain's runtime API.
 
+#### When to regenerate the interface?
+Whenever the types of the relevant pallets (OmniAccount, Teebag) change, the interface should be regenerated. This can be done by following the steps in the Generation Process section.
+
+Please note that the metadata fetched from the local node may not be the same as the metadata of the live chains. Therefore, when running the worker agains the live chains, the metadata should be fetched from the live chain and the interface should be regenerated.
+
 ## Generation Process
 
 The API interface can be generated using the following commands:
 
 1. First, get the pallet metadata (requires a running node):
 ```bash
-make get-pallet-metadata
+make get-metadata
 ```
 This will fetch the metadata from a local node (http://localhost:9944) and save it as a scale file.