Update readme

tests/src/migrations/942057-appPromotion/README.md

@@ -1,25 +1,40 @@
+# Update Procedure
+
+- Enable maintenance mode
+- [Collect migration data using ChainQL](#stakers-data-loading)
+- ❗️❗️❗️ Initiate the runtime upgrade only at this point ❗️❗️❗️
+- Wait for the upgrade to complete
+- [Execute offchain migration](#execute-offchain-migration)
+- Disable maintenance mode
+
 ## Stakers Data Loading
 
 Set the environment variable (WS_RPC). For example, ws://localhost:9944. Execute the following command:
 
+```sh
 chainql --tla-str=chainUrl=<WS_RPC> stakersParser.jsonnet > output.json
+```
 
-    where <WS_RPC> - is the network address.
+where `<WS_RPC>` - is the network address.
 
 Example for Opal:
-:
 
+```sh
 chainql --tla-str=chainUrl=wss://eu-ws-opal.unique.network:443 stakersParser.jsonnet > output.json
+```
 
 To install chainql, execute the following command:
 
-
+```sh
 cargo install chainql
+```
 
 ## Execute offchain migration
 
-To run, you need to add an environment variable (SUPERUSER_SEED) with the sudo key seed.
+To run, you need to add an environment variable (`SUPERUSER_SEED`) with the sudo key seed.
 
 Run the script by executing the following command:
 
-npx ts-node lockedToFreeze.ts
+```sh
+npx ts-node --esm lockedToFreeze.ts
+```