fill in basic details for remaining processors/modules

src/content/docs/processors/nats/message/create.md

@@ -5,7 +5,16 @@ sidebar:
     order: 1
 ---
 
+This processor will create a NATS message from the provided parameters. This processor will return an error if any of the required parameters are missing or if the parameters are of the wrong type.
 - **type**: `nats.message.create`
 - **params**:
-    - **subject**
-    - **payload**
+    - **subject**: the subject to publish the message to.
+    - **payload**: the payload of the message.
+
+### Example
+```
+- type: nats.message.create
+  params:
+    subject: "events"
+    payload: "Hello, World!"
+```