fixup! chore: Document SSH passphrase injection as an experimental feature

Author: AObuchow

docs/additional-configuration.adoc

@@ -189,7 +189,7 @@ Prerequisites:
 ** The steps below assume the following environment variables are set:
 *** `$SSH_KEY`: path on disk to private key for SSH keypair (e.g. `~/.ssh/id_ed25519`)
 *** `$SSH_PUB_KEY`: path on disk to public key for SSH keypair (e.g. `~/.ssh/id_ed25519.pub`)
-*** `$PASSPHRASE`: SSH keypair passphrase (optional). Requires setting `config.enableExperimentalFeatures: true` in the DevWorkspaceOperatorConfig.
+*** `$PASSPHRASE`: SSH keypair passphrase (optional). *Note:* requires setting `config.enableExperimentalFeatures: true` in the DevWorkspaceOperatorConfig.
 *** `$NAMESPACE`: namespace where workspaces using the SSH keypair will be started.
 
 Process: