clean up language error and fluffy comments

src/shogun/multiclass/BruteKNNSolver.h

@@ -15,10 +15,7 @@
 namespace shogun
 {
 
-/**
- * The BruteKNNSolver class is a solver class which inherit from KNNSolver class. It will use brute way
- * to classify the object which mean compare the object against all training objects for each prediction.
- */
+/* Standard KNN solver. Test points are compared to all training data for each prediction. */
 class CBruteKNNSolver : public CKNNSolver
 {
 	public:

src/shogun/multiclass/CoverTreeKNNSolver.h

@@ -17,9 +17,8 @@ namespace shogun
 {
 
 /**
- * The CoverTreeKNNSolver class is a solver class which inherit from KNNSolver class. 
- * It use the cover tree to speed up the nearest neighbor search and you can find more
- * detail information on https://en.wikipedia.org/wiki/Cover_tree
+ * Cover tree solver. It uses cover trees to speed up the nearest neighbour computation.
+ * For more information, see https://en.wikipedia.org/wiki/Cover_tree
  *
  */
 class CCoverTreeKNNSolver : public CKNNSolver

src/shogun/multiclass/KDTreeKNNSolver.h

@@ -16,10 +16,9 @@ namespace shogun
 {
 
 /**
- * The KDTREEKNNSolver class is a solver class which inherit from KNNSolver class.
- * It use a k-d tree (short for k-dimensional tree) to delivery the nearest neighbor searches
- * involving the multidimensional search key.
- * Check https://en.wikipedia.org/wiki/K-d_tree for more detail about K-D tree.
+ * KD-tree solver. It uses k-d tree (short for k-dimensional tree) to speed up the 
+ * nearest neighbour computation. 
+ * For more information, see https://en.wikipedia.org/wiki/K-d_tree
  *
  */
 class CKDTREEKNNSolver : public CKNNSolver

src/shogun/multiclass/KNNSolver.h

@@ -15,11 +15,7 @@
 
 namespace shogun
 {
-/**
- * The KNNSolver class is the virtual base class of BruteKNNSolcer, CoverTreeKNNSolver, KDTreeKNNsolver, LSHKNNSolver. 
- * The KNNSolver class will include most of Variables which been used all the other Solver and methods been used to choose 
- * the index of the most frequent class.
- */
+/* Virtual base class for all KNN solvers */
 
 class CDistanceMachine;
 class CKNNSolver : public CDistanceMachine

src/shogun/multiclass/LSHKNNSolver.h

@@ -16,9 +16,8 @@ namespace shogun
 {
 
 /**
- * The LSHKNNSolver class is a solver class which inherit from KNNSolver class.
- * It use LSH(short for Locality-sensitive hashing) to do the nearest neighbor search.
- * More detail information can be found in https://en.wikipedia.org/wiki/Locality-sensitive_hashing.
+ * LSH solver. It uses LSH (short for Locality-sensitive hashing) to do the nearest neighbour computation.
+ * For more information, see https://en.wikipedia.org/wiki/Locality-sensitive_hashing.
  *
  */
 #ifdef HAVE_CXX11