[TRAVIS] cleanup travis script

src/common/config.h

@@ -147,7 +147,7 @@ class ConfigStreamReader: public ConfigReaderBase {
  public:
   /*!
    * \brief constructor
-   * \param istream input stream
+   * \param fin istream input stream
    */
   explicit ConfigStreamReader(std::istream &fin) : fin(fin) {}
 

src/common/group_data.h

@@ -91,7 +91,8 @@ struct ParallelGroupBuilder {
    * \brief step 4: add data to the allocated space,
    *   the calls to this function should be exactly match previous call to AddBudget
    *
-   * \param key the key of
+   * \param key the key of group.
+   * \param value The value to be pushed to the group.
    * \param threadid the id of thread that calls this function
    */
   inline void Push(size_t key, ValueType value, int threadid) {

src/common/quantile.h

@@ -631,7 +631,7 @@ class QuantileSketchTemplate {
      * \brief do elementwise combination of summary array
      *        this[i] = combine(this[i], src[i]) for each i
      * \param src the source summary
-     * \param max_nbyte, maximum number of byte allowed in here
+     * \param max_nbyte maximum number of byte allowed in here
      */
     inline void Reduce(const Summary &src, size_t max_nbyte) {
       this->Reserve((max_nbyte - sizeof(this->size)) / sizeof(Entry));
@@ -688,7 +688,8 @@ class QuantileSketchTemplate {
   }
   /*!
    * \brief add an element to a sketch
-   * \param x the element added to the sketch
+   * \param x The element added to the sketch
+   * \param w The weight of the element.
    */
   inline void Push(DType x, RType w = 1) {
     if (w == static_cast<RType>(0)) return;