Remove technical preview markers for 'unprivileged' mode (#1341)

docs/en/ingest-management/commands.asciidoc

@@ -521,8 +521,6 @@ elastic-agent inspect components log-default
 [[elastic-agent-privileged-command]]
 == elastic-agent privileged
 
-preview::[]
-
 Run {agent} with full superuser privileges.
 This is the usual, default running mode for {agent}.
 The `privileged` command allows you to switch back to running an agent with full administrative privileges when you have been running it in `unprivileged` mode. 
@@ -1151,8 +1149,6 @@ elastic-agent uninstall
 [[elastic-agent-unprivileged-command]]
 == elastic-agent unprivileged
 
-preview::[]
-
 Run {agent} without full superuser privileges.
 This is useful in organizations that limit `root` access on Linux or macOS systems, or `admin` access on Windows systems.
 For details and limitations for running {agent} in this mode, refer to {fleet-guide}/elastic-agent-unprivileged.html[Run {agent} without administrative privileges].

docs/en/ingest-management/elastic-agent/elastic-agent-unprivileged-mode.asciidoc

@@ -1,8 +1,6 @@
 [[elastic-agent-unprivileged]]
 = Run {agent} without administrative privileges
 
-preview::[]
-
 Beginning with {stack} version 8.15, {agent} is no longer required to be run by a user with superuser privileges. You can now run agents in an `unprivileged` mode that does not require `root` access on Linux or macOS, or `admin` access on Windows. Being able to run agents without full administrative privileges is often a requirement in organizations where this kind of access is often very limited.
 
 In general, agents running without full administrative privileges will perform and behave exactly as those run by a superuser. There are certain integrations and datastreams that are not available, however. If an integration requires root access, this is <<unprivileged-integrations,indicated on the integration main page>>.