fill in basic details for remaining processors/modules

src/content/docs/processors/midi/message/decode.md

@@ -4,5 +4,11 @@ sidebar:
     label: Decode
     order: 3
 ---
+This processor will decode incoming bytes into a MIDI message. This processor will return an error if the message being processed is not an array of bytes.
 
-- **type**: `midi.message.decode`
+- **type**: `midi.message.decode`
+
+### Example
+```
+- type: midi.message.decode
+```

src/content/docs/processors/midi/message/encode.md

@@ -4,5 +4,11 @@ sidebar:
     label: Encode
     order: 2
 ---
+This processor will encode a MIDI message into an array of bytes. This processor will return an error if the message being processed is not a MIDI message.
 
 - **type**: `midi.message.encode`
+
+### Example
+```
+- type: midi.message.encode
+```

src/content/docs/processors/midi/message/unpack.md

@@ -4,5 +4,11 @@ sidebar:
     label: Unpack
     order: 4
 ---
+This processor will unpack a MIDI message into its individual components. This processor will return an error if the message being processed is not a MIDI message.
 
 - **type**: `midi.message.unpack`
+
+### Example
+```
+- type: midi.message.unpack
+```