chore(readme): correct wordings

postgres-java-example/README.md

 ## How to run
 1. Install picodata 
-2. Run picodata with the following command:
+2. Run picodata using provided config with the following command:
 ```bash
 picodata run --config picodata_config.yaml 
 ```
-3. Prepare data schema for example app with:
+3. Prepare database schema for example app with:
 ```bash
 cat before.sql | picodata admin ./admin.sock
 ```