[8.x] [docs] Update `kibana.yml` defaults (#206423) (#206502)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[docs] Update `kibana.yml` defaults
(#206423)](#206423)

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

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Update `kibana.yml` defaults
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Update `kibana.yml` defaults
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Update `kibana.yml` defaults
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Co-authored-by: Alejandro Fernández Haro <[email protected]>

config/kibana.yml

@@ -63,7 +63,7 @@
 #elasticsearch.requestTimeout: 30000
 
 # The maximum number of sockets that can be used for communications with elasticsearch.
-# Defaults to `Infinity`.
+# Defaults to `800`.
 #elasticsearch.maxSockets: 1024
 
 # Specifies whether Kibana should use compression for communications with elasticsearch