Fix docs for event filters (#4365)

website/content/docs/concepts/filtering/events.mdx

@@ -72,8 +72,8 @@ sink "stderr" = {
     event_types = ["*"]
     format = "cloudevents-text"
     allow_filters = [
-        '"/data/request_info/path" contains ":authenticate"'
-        '"/data/op" contains ".createClientConn"'
+        "\"/data/request_info/path\" contains \":authenticate\"",
+        "\"/data/op\" contains \".createClientConn\"",
     ]
     # note: deny_filters are also supported.
 }

website/content/docs/configuration/events/common.mdx

@@ -24,7 +24,7 @@ These parameters are shared across all sink types:
   sink. If any filter matches, the event will be included. For more information,
   on using filters see: [event filtering](/boundary/docs/concepts/filtering/events)
 
-- `deny-filters` - Specifies a set predicates for excluding an event in the
+- `deny_filters` - Specifies a set predicates for excluding an event in the
   sink. If any filter matches, the event will be excluded. For more information
   on using filters see: [event filtering](/boundary/docs/concepts/filtering/events)