add notes about module interface implementations

src/content/docs/modules/db/sqlite.mdx

@@ -10,6 +10,8 @@ The `db.sqlite` module can open/create SQLite databases
 - **params**:
   - **dsn**: the data source name, this can be a file path or the special `:memory:` name for an in-memory DB
 
+This module implements the `DatabaseModule` interface.
+
 ## Cap
 
 ### Example snippet

src/content/docs/modules/mqtt/client.mdx

@@ -13,6 +13,8 @@ The `mqtt.client` module connects to a MQTT broker and emits a message messages
   - **topic** mqtt topic to subscribe to
   - **clientId** client ID for this connection to the broker
 
+This module implements the `PubSubModule` interface.
+
 ### Example
 
 Open a mqtt connection to `test.mosquitto.org` subscribing to the `showbridge` topic.

src/content/docs/modules/nats/client.mdx

@@ -12,6 +12,8 @@ This module connects to a [NATS](https://nats.io/) server and subscribes to a su
   - **url**: the URL of the NATS server to connect to (e.g. `nats://localhost:4222`)
   - **subject**: the subject to subscribe to
 
+This module implements the `PubSubModule` interface.
+
 ### Example
 
 Connect to a local NATS server and subscribe to the `events` subject

src/content/docs/modules/redis/client.mdx

@@ -12,6 +12,8 @@ The `redis.client` module connects to a Redis server. This module does not produ
   - **host**: the Redis server host
   - **port**: the Redis server port
 
+This module implements the `KeyValueModule` interface.
+
 ### Example
 
 Connect to a Redis server running on `localhost` at port `6379`.

src/content/docs/processors/db/query.mdx

@@ -6,6 +6,8 @@ sidebar:
 ---
 
 The `db.query` processor will issue a query to the specified module and return the result to the next processor in line.
+The module must implement the `DatabaseModule` interface for this processor to work.
+This processor will return an error if any of the required parameters are missing/invalid or if the module does not implement the `DatabaseModule` interface.
 
 - **type**: `db.query`
 - **params**:

src/content/docs/processors/kv/get.mdx

@@ -5,7 +5,8 @@ sidebar:
   order: 1
 ---
 
-The `kv.get` processor gets the value associated with a key from a compatible module. The output payload is the value if the key is found.
+The `kv.get` processor gets the value associated with a key from a module that implements the `KeyValueModule` interface.
+The output payload is the value if the key is found.
 
 - **type**: `kv.get`
 - **params**:

src/content/docs/processors/kv/set.mdx

@@ -5,7 +5,7 @@ sidebar:
   order: 2
 ---
 
-The `kv.set` processor sets the value associated with a key from a compatible module. The payload is unchanged so whatever is received by this payload is output unless any errors are encountered.
+The `kv.set` processor sets the value associated with a key from a module that implements the `KeyValueModule` interface. The payload is unchanged so whatever is received by this payload is output unless any errors are encountered.
 
 - **type**: `kv.set`
 - **params**:

src/content/docs/processors/pubsub/publish.mdx

@@ -5,7 +5,9 @@ sidebar:
   order: 1
 ---
 
-This processor will publish the incoming payload to a Pub/Sub capable module. This processor will return an error if any of the required parameters are missing or if the parameters are of the wrong type.
+This processor will publish the incoming payload to a module that implements the `PubSubModule` interface.
+This processor will return an error if any of the required parameters are missing or if the parameters are of the wrong type.
+The payload is unchanged so whatever is received by this payload is output unless any errors are encountered.
 
 - **type**: `pubsub.publish`
 - **params**: