Update README.md

Author: jessiemongeon1

motoko/pub-sub/README.md

@@ -16,7 +16,11 @@ A common problem in both distributed and decentralized systems is keeping separa
 
 ### 3. Navigate into the project's directory.
 
-### 4. Run `dfx start --background --clean && dfx deploy` to deploy the project to your local environment. 
+### 4. Deploy the project to your local environment:
+
+```
+dfx start --background --clean && dfx deploy
+```
 
 ## Security considerations and best practices