More corrections

Author: karenzone

reference/fleet/logstash-output.md

@@ -37,7 +37,7 @@ input {
   elastic_agent {
     port => 5044
     enrich => none <1>
-    ssl => true
+    ssl_enabled => true
     ssl_certificate_authorities => ["<ca_path>"]
     ssl_certificate => "<server_cert_path>"
     ssl_key => "<server_cert_key_in_pkcs8>"