Made spec more clear

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403766

dlib/svm/function_abstract.h

@@ -27,7 +27,7 @@ namespace dlib
                 top of dlib/svm/kernel_abstract.h
 
             WHAT THIS OBJECT REPRESENTS 
-                This object represents a decision or regression function that was 
+                This object represents a classification or regression function that was 
                 learned by a kernel based learning algorithm.  
         !*/