[Profiling] correctly document minimum kernel for ARM64 (#3169) (#3171)

(cherry picked from commit e0683e3)

Co-authored-by: Joel Höner <[email protected]>

docs/en/observability/profiling-get-started.asciidoc

@@ -23,7 +23,8 @@ See the <<profiling-send-feedback, send feedback>> section of the troubleshootin
 Before setting up Universal Profiling, make sure you meet the following requirements:
 
 * An {stack} deployment on http://cloud.elastic.co[{ecloud}] at version 8.7.0 or higher. Universal Profiling is currently only available on Elastic Cloud.
-* The workloads you're profiling must be running on Linux machines with x86_64 CPUs and kernel version >= 4.15.
+* The workloads you're profiling must be running on Linux machines with x86_64 or ARM64 CPUs.
+* The minimum supported kernel version is either 4.15 for x86_64 or 5.5 for ARM64 machines.
 * The Integrations Server must be enabled on your {ecloud} deployment.
 * Credentials (username and password) for the `superuser` Elasticsearch role (typically, the `elastic` user).