update readme

Signed-off-by: owenowenisme <mses010108@gmail.com>

Author: owenowenisme

README.md

@@ -70,11 +70,11 @@ Apache Polaris is built using Gradle with Java 21+ and Docker 27+.
 - `./gradlew test` - To run unit tests and integration tests.
 - `./gradlew run` - To run the Polaris server locally; the server is reachable at 
     localhost:8181. This is also suitable for running regression tests, or for connecting with Spark. 
-  - If you start Polaris as a direct java process via `./gradlew run`, you can set your own credentials using the environment variable `export POLARIS_BOOTSTRAP_CREDENTIALS=POLARIS,root,secret` where:
+  - If you start Polaris via `./gradlew run`, you can set your own credentials by specifying system property `./gradlew run -Dpolaris.bootstrap.credentials=POLARIS,root,secret` where:
     - `POLARIS` is the realm
     - `root` is the CLIENT_ID
     - `secret` is the CLIENT_SECRET
-  - If credentials are not set, it will use preset credentials `POLARIS,root,secret`
+    - If credentials are not set, it will use preset credentials `POLARIS,root,secret`
 - `./regtests/run_spark_sql.sh` - To connect from Spark SQL. Here are some example commands to run in the Spark SQL shell:
 ```sql
 create database db1;