update readme

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

Author: owenowenisme

README.md

@@ -69,12 +69,13 @@ Apache Polaris is built using Gradle with Java 21+ and Docker 27+.
 - `./gradlew assemble` - To skip tests.
 - `./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. 
+    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:
+    - `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`
 - `./regtests/run_spark_sql.sh` - To connect from Spark SQL. Here are some example commands to run in the Spark SQL shell:
-- Set your own credentials using the environment variable `export POLARIS_BOOTSTRAP_CREDENTIALS=POLARIS,root,s3cr3t` where:
-  - `POLARIS` is the realm
-  - `root` is the CLIENT_ID
-  - `s3cr3t` is the CLIENT_SECRET
 ```sql
 create database db1;
 show databases;