[8.x] [Docs] Document ability to drag and drop columns in Discover (#…

…201571) (#201602)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[Docs] Document ability to drag and drop columns in Discover
(#201571)](#201571)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Co-authored-by: florent-leborgne <florent.leborgne@elastic.co>

docs/discover/document-explorer.asciidoc

@@ -29,7 +29,7 @@ image:images/discover-customize-table.png[Options to customize the table in Disc
 [[document-explorer-columns]]
 ==== Reorder and resize the columns
 
-* To move a single column, open the column's contextual options, and select *Move left* or *Move right* in the available options.
+* To move a single column, drag its header and drop it to the position you want. You can also open the column's contextual options, and select *Move left* or *Move right* in the available options.
 
 * To move multiple columns, click *Columns*.
 In the pop-up, drag the column names to their new order.