nit

docs/core_concepts/40_websocket_triggers/index.mdx

@@ -31,7 +31,7 @@ If you use a preprocessor, the `wm_trigger` object will be of the form:
 
 The trigger also supports additional configuration options:
 
-**Initial messages**
+### Initial messages
 
 You can specify a list of initial messages to send to the websocket server when connection to the server is established.
 This is useful for authentication or subscription messages.
@@ -42,7 +42,7 @@ The messages are sent in the order they are specified.
 
 ![Initial messages](./initial_messages.png 'Initial messages')
 
-**Filters**
+### Filters
 
 
 Instead of having all messages trigger the runnable, you can specify a filter to only trigger the runnable when the message matches the filter.