Update JDBC Getting-started example's README.md to use localhost for curl commands (#1872)

Author: HonahX

getting-started/jdbc/README.md

@@ -65,8 +65,7 @@ This example requires `jq` to be installed on your machine.
 4. To access Polaris from the host machine, first request an access token:
 
     ```shell
-    export POLARIS_TOKEN=$(curl -s http://polaris:8181/api/catalog/v1/oauth/tokens \
-       --resolve polaris:8181:127.0.0.1 \
+    export POLARIS_TOKEN=$(curl -s http://localhost:8181/api/catalog/v1/oauth/tokens \
        --user root:s3cr3t \
        -d 'grant_type=client_credentials' \
        -d 'scope=PRINCIPAL_ROLE:ALL' | jq -r .access_token)
@@ -75,8 +74,8 @@ This example requires `jq` to be installed on your machine.
 5. Then, use the access token in the Authorization header when accessing Polaris:
 
     ```shell
-    curl -v http://127.0.0.1:8181/api/management/v1/principal-roles -H "Authorization: Bearer $POLARIS_TOKEN"
-    curl -v http://127.0.0.1:8181/api/management/v1/catalogs/quickstart_catalog -H "Authorization: Bearer $POLARIS_TOKEN"
+    curl -v http://localhost:8181/api/management/v1/principal-roles -H "Authorization: Bearer $POLARIS_TOKEN"
+    curl -v http://localhost:8181/api/management/v1/catalogs/quickstart_catalog -H "Authorization: Bearer $POLARIS_TOKEN"
     ```
 
 6. Using Trino CLI: To access the Trino CLI, run this command: