out_syslog: handle multivalued structured data

Documentation change for PR fluent/fluent-bit#8355

Signed-off-by: Benoit Plessis <[email protected]>

Author: bplessis

pipeline/outputs/syslog.md

@@ -71,7 +71,8 @@ Example log:
     "uls@0": {
         "logtype": "access",
         "clustername": "mycluster",
-        "namespace": "mynamespace"
+        "namespace": "mynamespace",
+        "tag": [ "tag1", "tag2" ]
     },
     "log": "Sample app log message."
 }
@@ -99,5 +100,5 @@ Example configuration file:
 Example output:
 
 ```bash
-<14>1 2021-07-12T14:37:35.569848Z myhost myapp 1234 ID98 [uls@0 logtype="access" clustername="mycluster" namespace="mynamespace"] Sample app log message.
-```
+<14>1 2021-07-12T14:37:35.569848Z myhost myapp 1234 ID98 [uls@0 logtype="access" clustername="mycluster" namespace="mynamespace" tag="tag1" tag="tag2"] Sample app log message.
+```