[MINOR] docs: polish document for spark connector and Iceberg REST se…

…rver (apache#4899)

### What changes were proposed in this pull request?
polish document for spark connector and Iceberg REST server

### Why are the changes needed?

Fix: # (issue)

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

### How was this patch tested?
just document

docs/iceberg-rest-service.md

@@ -28,7 +28,7 @@ The Apache Gravitino Iceberg REST Server follows the [Apache Iceberg REST API sp
 ## Server management
 
 There are three deployment scenarios for Gravitino Iceberg REST server:
-- A standalone server with a standalone Gravitino Iceberg REST server package.
+- A standalone server in a standalone Gravitino Iceberg REST server package.
 - A standalone server in the Gravitino server package.
 - An auxiliary service embedded in the Gravitino server.
 

docs/manage-relational-metadata-using-gravitino.md

@@ -162,12 +162,12 @@ Catalog catalog = gravitinoClient.alterCatalog("catalog",
 
 Currently, Gravitino supports the following changes to a catalog:
 
-| Supported modification | JSON                                                         | Java                                           |
-|------------------------|--------------------------------------------------------------|------------------------------------------------|
-| Rename metalake        | `{"@type":"rename","newName":"metalake_renamed"}`            | `CatalogChange.rename("catalog_renamed")`      |
-| Update comment         | `{"@type":"updateComment","newComment":"new_comment"}`       | `CatalogChange.updateComment("new_comment")`   |
-| Set a property         | `{"@type":"setProperty","property":"key1","value":"value1"}` | `CatalogChange.setProperty("key1", "value1")`  |
-| Remove a property      | `{"@type":"removeProperty","property":"key1"}`               | `CatalogChange.removeProperty("key1")`         |
+| Supported modification | JSON                                                         | Java                                          |
+|------------------------|--------------------------------------------------------------|-----------------------------------------------|
+| Rename catalog         | `{"@type":"rename","newName":"catalog_renamed"}`             | `CatalogChange.rename("catalog_renamed")`     |
+| Update comment         | `{"@type":"updateComment","newComment":"new_comment"}`       | `CatalogChange.updateComment("new_comment")`  |
+| Set a property         | `{"@type":"setProperty","property":"key1","value":"value1"}` | `CatalogChange.setProperty("key1", "value1")` |
+| Remove a property      | `{"@type":"removeProperty","property":"key1"}`               | `CatalogChange.removeProperty("key1")`        |
 
 :::warning
 

docs/spark-connector/spark-connector.md

@@ -27,7 +27,7 @@ Gravitino Spark connector doesn't support Scala 2.13 for Spark3.3.
 
 ## How to use it
 
-1. [Build](../how-to-build.md) or download ([gravitino-spark-connector-runtime-3.3](https://mvnrepository.com/artifact/org.apache.gravitino/gravitino-spark-connector-runtime-3.3), [gravitino-spark-connector-runtime-3.4](https://mvnrepository.com/artifact/org.apache.gravitino/gravitino-spark-connector-runtime-3.4), [gravitino-spark-connector-runtime-3.5](https://mvnrepository.com/artifact/org.apache.gravitino/gravitino-spark-connector-runtime-3.5)) (https://mvnrepository.com/artifact/org.apache.gravitino/spark-connector-runtime), and place it to the classpath of Spark.
+1. [Build](../how-to-build.md) or download the package ([gravitino-spark-connector-runtime-3.3](https://mvnrepository.com/artifact/org.apache.gravitino/gravitino-spark-connector-runtime-3.3), [gravitino-spark-connector-runtime-3.4](https://mvnrepository.com/artifact/org.apache.gravitino/gravitino-spark-connector-runtime-3.4), [gravitino-spark-connector-runtime-3.5](https://mvnrepository.com/artifact/org.apache.gravitino/gravitino-spark-connector-runtime-3.5)), and place it to the classpath of Spark.
 2. Configure the Spark session to use the Gravitino spark connector.
 
 | Property                                 | Type   | Default Value | Description                                                                                     | Required | Since Version |