update vault and tls wording and env var config

src/concepts/config-intro.md

@@ -108,11 +108,11 @@ Using a [filesystem](../reference/config/vaults/vault-filesystem.md) vault, you
 
 ```yaml{6}
 vaults:
-  your_server_certificate:
+  your_servers:
     type: filesystem
     options:
       keys:
-        store: your_server.p12
+        store: your_servers.p12
         type: pkcs12
         password: ${{env.KEYSTORE_PASSWORD}}
 ```
@@ -139,7 +139,7 @@ bindings:
   tls_server:
     type: tls
     kind: server
-    vault: your_server_certificate
+    vault: your_servers
     options:
       keys:
         - your_server.com

src/how-tos/mqtt/mqtt.kafka.broker.md

@@ -105,6 +105,7 @@ export KAFKA_PORT=29092
 Create these topics in the Kafka environment.
 
 ```bash:no-line-numbers
+\
 /bin/kafka-topics.sh --bootstrap-server $KAFKA_HOST:$KAFKA_PORT --create --if-not-exists --topic mqtt-sessions
 /bin/kafka-topics.sh --bootstrap-server $KAFKA_HOST:$KAFKA_PORT --create --if-not-exists --topic mqtt-messages --config cleanup.policy=compact
 /bin/kafka-topics.sh --bootstrap-server $KAFKA_HOST:$KAFKA_PORT --create --if-not-exists --topic mqtt-retained --config cleanup.policy=compact
@@ -184,17 +185,22 @@ With your `zilla.yaml` config, follow the [Zilla install instructions](../instal
 --env KAFKA_HOST="$KAFKA_HOST" --env KAFKA_PORT="$KAFKA_PORT"
 ```
 
-@tab Helm
+@tab Helm values.yaml
 
-```bash:no-line-numbers
---set extraEnv[1].value="$KAFKA_HOST",extraEnv [2].value="$KAFKA_PORT" \
+```yaml:no-line-numbers
+# use the values from $KAFKA_HOST $KAFKA_PORT variables
+extraEnv:
+  - name: KAFKA_HOST
+    value: "host.docker.internal"
+  - name: KAFKA_PORT
+    value: "29092"
 ```
 
 :::
 
 ### Adding TLS
 
-You can add TLS to to this broker by adding a vault and tls binding described in the [Server Encryption](../../concepts/config-intro.html#server-encryption-tls-ssl) section. The main difference other than the port numbers is the [mqtt server](../../reference/config/bindings/binding-mqtt.md) binding doesn't require and [alpn](../reference/config/bindings/binding-tls.md#options-alpn) option.
+You can add TLS to this broker by adding a vault and tls binding as described in the [Server Encryption](../../concepts/config-intro.md#server-encryption-tls-ssl) section. Besides the port numbers, the difference regarding an MQTT broker is that you don't need to add the [alpn](../reference/config/bindings/binding-tls.md#options-alpn) option to the [tls](../reference/config/bindings/binding-tls.md) binding.
 
 ## Remove the running containers