doc: GetArrayItem is now supported (#3880)

Author: kazuyukitanimura

docs/source/user-guide/latest/compatibility.md

@@ -64,10 +64,6 @@ the [Comet Supported Expressions Guide](expressions.md) for more information on
   [#3346](https://github.com/apache/datafusion-comet/issues/3346)
 - **ArrayRemove**: Returns null when the element to remove is null, instead of removing null elements from the array.
   [#3173](https://github.com/apache/datafusion-comet/issues/3173)
-- **GetArrayItem**: Known correctness issues with index handling, including off-by-one errors and incorrect results
-  with dynamic (non-literal) index values.
-  [#3330](https://github.com/apache/datafusion-comet/issues/3330),
-  [#3332](https://github.com/apache/datafusion-comet/issues/3332)
 - **ArraysOverlap**: Inconsistent behavior when arrays contain NULL values.
   [#3645](https://github.com/apache/datafusion-comet/issues/3645),
   [#2036](https://github.com/apache/datafusion-comet/issues/2036)

docs/source/user-guide/latest/expressions.md

@@ -250,7 +250,7 @@ Comet supports using the following aggregate functions within window contexts wi
 | CreateArray    | Yes               |                                                                                                                                                                                           |
 | ElementAt      | Yes               | Input must be an array. Map inputs are not supported.                                                                                                                                     |
 | Flatten        | Yes               |                                                                                                                                                                                           |
-| GetArrayItem   | No                | Known correctness issues with index handling ([#3330](https://github.com/apache/datafusion-comet/issues/3330), [#3332](https://github.com/apache/datafusion-comet/issues/3332))           |
+| GetArrayItem   | Yes               |                                                                                                                                                                                           |
 
 ## Map Expressions