[8.17] Corrects the default max spaces in non-serverless docs (#203857)…

… (#205981)

# Backport

This will backport the following commits from `main` to `8.17`:
- [Corrects the default max spaces in non-serverless docs
(#203857)](#203857)

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

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

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Summary\r\n\r\nThe max spaces is described as 100, but should be 1000 by
default only\r\nin our non-serverless offerings. Only serverless is
currently limited
to\r\n100.\r\n\r\nSee\r\nhttps://www.elastic.co/guide/en/kibana/current/xpack-spaces.html#spaces-managing\r\n\r\n---------\r\n\r\nCo-authored-by:
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currently limited
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BACKPORT-->

Co-authored-by: Jeramy Soucy <[email protected]>

docs/spaces/index.asciidoc

@@ -23,7 +23,7 @@ The `kibana_admin` role or equivalent is required to manage **Spaces**.
 === Create a space
 
 [[spaces-control-feature-visibility]]
-You can have up to 100 spaces. 
+You can have up to 1,000 spaces by default. The maximum number of spaces can be configured by the `xpack.spaces.maxSpaces` setting (refer to <<spaces-settings-kb, Spaces settings in {kib}>>).
 
 . Select *Create space* and provide a name, description, and URL identifier.
 +