[MINOR] docs: improve Gravitino document (#2128)

### What changes were proposed in this pull request?
1. Gravitino supports JDK8, JDK11, JDK17
2. export 9001 to Gravitino docker image example
3. Iceberg REST service HTTP port is not required.

### Why are the changes needed?
Fix: # (issue)

### Does this PR introduce _any_ user-facing change?
no

### How was this patch tested?
just document

Co-authored-by: FANNG <xiaojing@datastrato.com>

docs/docker-image-details.md

@@ -17,7 +17,7 @@ You can deploy the service with the Gravitino Docker image.
 Container startup commands
 
 ```shell
-docker run --rm -d -p 8090:8090 datastrato/gravitino
+docker run --rm -d -p 8090:8090 -p 9001:9001 datastrato/gravitino
 ```
 
 Changelog

docs/iceberg-rest-service.md

@@ -45,7 +45,7 @@ Please refer to the following sections for details.
 | `gravitino.auxService.names`                                | The auxiliary service name of the Gravitino Iceberg REST catalog service, use **`iceberg-rest`** for the Gravitino Iceberg REST catalog service.                                                                                                           | (none)                                                                       | Yes      | 0.2.0         |
 | `gravitino.auxService.iceberg-rest.classpath`               | The classpath of the Gravitino Iceberg REST catalog service, includes the directory containing jars and configuration. It supports both absolute paths and relative paths, for example, `catalogs/lakehouse-iceberg/libs, catalogs/lakehouse-iceberg/conf` | (none)                                                                       | Yes      | 0.2.0         |
 | `gravitino.auxService.iceberg-rest.host`                    | The host of the Gravitino Iceberg REST catalog service.                                                                                                                                                                                                    | `0.0.0.0`                                                                    | No       | 0.2.0         |
-| `gravitino.auxService.iceberg-rest.httpPort`                | The port of the Gravitino Iceberg REST catalog service.                                                                                                                                                                                                    | `9001`                                                                       | Yes      | 0.2.0         |
+| `gravitino.auxService.iceberg-rest.httpPort`                | The port of the Gravitino Iceberg REST catalog service.                                                                                                                                                                                                    | `9001`                                                                       | No       | 0.2.0         |
 | `gravitino.auxService.iceberg-rest.minThreads`              | The minimum number of threads in the thread pool used by the Jetty web server. `minThreads` is 8 if the value is less than 8.                                                                                                                              | `Math.max(Math.min(Runtime.getRuntime().availableProcessors() * 2, 100), 8)` | No       | 0.2.0         |
 | `gravitino.auxService.iceberg-rest.maxThreads`              | The maximum number of threads in the thread pool used by the Jetty web server. `maxThreads` is 8 if the value is less than 8, and `maxThreads` must be greater than or equal to `minThreads`.                                                              | `Math.max(Runtime.getRuntime().availableProcessors() * 4, 400)`              | No       | 0.2.0         |
 | `gravitino.auxService.iceberg-rest.threadPoolWorkQueueSize` | The size of the queue in the thread pool used by Gravitino Iceberg REST catalog service.                                                                                                                                                                   | `100`                                                                        | No       | 0.2.0         |

docs/index.md

@@ -18,9 +18,9 @@ metadata access for data and AI assets.
 You can get Gravitino from the [GitHub release page](https://github.com/datastrato/gravitino/releases),
 or you can build Gravitino from source code, please see [How to build Gravitino](./how-to-build.md).
 
-Gravitino runs on both Linux and macOS, and requires Java 8. Gravitino trino-connector runs with
+Gravitino runs on both Linux and macOS platforms, and it requires the installation of Java 8, Java 11, or Java 17. Gravitino trino-connector runs with
 Trino, and requires Java 17. This should include JVMs on x86_64 and
-ARM64. It's easy to run locally on one machine --- all you need is to have `java` installed on
+ARM64. It's easy to run locally on one machine, all you need is to have `java` installed on
 your system `PATH`, or the `JAVA_HOME` environment variable pointing to a Java installation.
 
 See [How to install Gravitino](./how-to-install.md) to learn how to install Gravitino server.