[8.15] [Reporting/CSV/Docs] Specify maximum value for scroll.duration setting (elastic#205765) (elastic#205773)

# Backport

This will backport the following commits from `main` to `8.15`:
- [[Reporting/CSV/Docs] Specify maximum value for scroll.duration
setting (elastic#205765)](elastic#205765)

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

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Co-authored-by: Tim Sullivan <[email protected]>

Author: kibanamachine

docs/settings/reporting-settings.asciidoc

@@ -271,7 +271,7 @@ The maximum {byte-units}[byte size] of a CSV file before being truncated. This s
 exports from causing performance and storage issues. Can be specified as a number of bytes. Defaults to `250mb`.
 
 `xpack.reporting.csv.scroll.size`::
-Number of documents retrieved from {es} for each scroll iteration during a CSV export. Defaults to `500`.
+Number of documents retrieved from {es} for each scroll iteration during a CSV export. The maximum value is `10000`. Defaults to `500`.
 [NOTE]
 ============
 You may need to lower this setting if the default number of documents creates a strain on network resources.