COMMON: Update class documentation to say they're now used by SCUMM

common/bitstream.h

@@ -31,7 +31,12 @@ namespace Common {
 
 class SeekableReadStream;
 
-/** A bit stream. */
+/**
+ * A bit stream.
+ *
+ * Used in engines:
+ *  - scumm
+ */
 class BitStream {
 public:
 	BitStream();

common/dct.h

@@ -35,7 +35,12 @@
 
 namespace Common {
 
-/** (Inverse) Discrete Cosine Transforms. */
+/**
+ * (Inverse) Discrete Cosine Transforms.
+ *
+ * Used in engines:
+ *  - scumm
+ */
 class DCT {
 public:
 	enum TransformType {

common/fft.h

@@ -34,7 +34,12 @@
 
 namespace Common {
 
-/** (Inverse) Fast Fourier Transform. */
+/**
+ * (Inverse) Fast Fourier Transform.
+ *
+ * Used in engines:
+ *  - scumm
+ */
 class FFT {
 public:
 	FFT(int bits, int inverse);

common/huffman.h

@@ -33,7 +33,12 @@ namespace Common {
 
 class BitStream;
 
-/** Decode a Huffman'd bitstream. */
+/**
+ * Huffman bitstream decoding
+ *
+ * Used in engines:
+ *  - scumm
+ */
 class Huffman {
 public:
 	/** Construct a Huffman decoder.

common/rdft.h

@@ -33,7 +33,13 @@
 
 namespace Common {
 
-/** (Inverse) Real Discrete Fourier Transform. */
+/**
+ * (Inverse) Real Discrete Fourier Transform.
+ *
+ * Used in engines:
+ *  - scumm
+ */
+
 class RDFT {
 public:
 	enum TransformType {