Added missing documentation to the source code in the Playdate bindings target.

Sources/PlaydateKit/Sound/Enumerations/Format.swift

@@ -13,8 +13,11 @@ extension Sound {
         init(_ format: SoundFormat) { self = Format(rawValue: UInt32(format.rawValue)) ?? .mono16bit }
         var cValue: SoundFormat { SoundFormat(SoundFormat.RawValue(rawValue)) }
 
+        /// Whether the format has two channels.
         public var isStereo: Bool { rawValue & 1 != 0 }
+        /// Whether samples are 16-bit (rather than 8-bit or ADPCM).
         public var is16bit: Bool { rawValue >= 2 && rawValue < 4 }
+        /// The size of one sample frame, in bytes.
         public var bytesPerFrame: Int { Int(SoundFormat_bytesPerFrame(cValue)) }
     }
 }

Sources/PlaydateKit/Sound/Enumerations/MicSource.swift

@@ -1,8 +1,12 @@
 extension Sound {
     /// The microphone used when recording.
     public enum MicSource: UInt32, Sendable {
+        /// Use the headset microphone if one is connected, otherwise the
+        /// built-in microphone.
         case autodetect = 0
+        /// Always use the built-in microphone.
         case internalMic = 1
+        /// Always use the headset microphone.
         case headset = 2
     }
 }