Fixed input to Doxygen.

git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@6 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8

src/Doxyfile

@@ -459,7 +459,7 @@ WARN_LOGFILE           =
 # directories like "/usr/src/myproject". Separate the files or directories 
 # with spaces.
 
-INPUT                  = base matrix util feat tree gmm sgmm fstext hmm optimization \
+INPUT       = doc base matrix util feat tree gmm sgmm fstext hmm optimization \
 	    transform lm decoder bin fstbin gmmbin fgmmbin sgmmbin featbin
 
 # If the value of the INPUT tag contains directories, you can use the