[DOCS] More info on disabling swap (#37248)

* [DOCS] More info on disabling swap, inform that no Elasticsearch restart is required.

docs/reference/setup/sysconfig/swap.asciidoc

@@ -28,6 +28,8 @@ On Linux systems, you can disable swap temporarily by running:
 sudo swapoff -a
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+This doesn't require a restart of Elasticsearch.
+
 To disable it permanently, you will need to edit the `/etc/fstab` file and
 comment out any lines that contain the word `swap`.