Fix some docs weirdness with default implementations

Author: tsolomko

Sources/BitReader.swift

@@ -48,8 +48,6 @@ public protocol BitReader: class {
 extension BitReader {
 
     /**
-     Reads `count` bits and returns them as an array of `UInt8`, advancing by `count` BIT positions.
-
      - Warning: Doesn't check if there is any data left.
      */
     public func bits(count: Int) -> [UInt8] {

Sources/BitWriter.swift

@@ -39,7 +39,6 @@ public protocol BitWriter {
 
 extension BitWriter {
 
-    /// Writes `bits`, advancing by `bits.count` BIT positions.
     public func write(bits: [UInt8]) {
         for bit in bits {
             self.write(bit: bit)