docs(readme): cleanup examples

README.md

@@ -16,7 +16,6 @@ ginkgo test -vvv ./tests
 
 ## Current limitations:
 
-1. [CRITICAL FEATURE] Drain API is not in public YDB Maintenance GRPC api yet. Therefore, `ydbops` currently relies on builtin drain when restarting nodes (which has a certain timeout, and a node with a lot of tablets will probably not shutdown healthily). Will be implemented as soon as 
 1. [NON-CRITICAL FEATURE] Yandex IAM authorization with SA account key file is currently unsupported. However, you can always issue the token yourself and put it inside the `YDB_TOKEN` variable: `export YDB_TOKEN=$(ycp --profile <profile> iam create-token)`
 
 ## How to use:
@@ -32,6 +31,15 @@ ydbops restart --storage \
   --verbose --hosts <node1-fqdn>,<node2-fqdn>,<node3-fqdn>
 ```
 
+#### Restarting hosts without specifying filters will restart all of them
+
+```
+ydbops restart --storage \
+  --endpoint grpc://<cluster-fqdn> \
+  --ssh-args=pssh,-A,-J,<bastion-fqdn>,--ycp-profile,prod,--no-yubikey \
+  --verbose
+```
+
 ##### Run hello-world on remote hosts
 
 ```