Fix spelling in documents (#6948)

* Update roxygen2 doc.

Co-authored-by: fis <jm.yuan@outlook.com>

rabit/include/rabit/c_api.h

@@ -25,7 +25,7 @@
 typedef unsigned long rbt_ulong;  // NOLINT(*)
 
 /*!
- * \brief intialize the rabit module,
+ * \brief initialize the rabit module,
  *  call this once before using anything
  *  The additional arguments is not necessary.
  *  Usually rabit will detect settings
@@ -87,7 +87,7 @@ RABIT_DLL void RabitGetProcessorName(char *out_name,
  * \brief broadcast an memory region to all others from root
  *
  *     Example: int a = 1; Broadcast(&a, sizeof(a), root);
- * \param sendrecv_data the pointer to send or recive buffer,
+ * \param sendrecv_data the pointer to send or receive buffer,
  * \param size the size of the data
  * \param root the root of process
  */
@@ -122,12 +122,12 @@ RABIT_DLL int RabitAllgather(void *sendrecvbuf, size_t total_size,
  *     ...
  *     Allreduce<op::Sum>(&data[0], data.size());
  *     ...
- * \param sendrecvbuf buffer for both sending and recving data
+ * \param sendrecvbuf buffer for both sending and receiving data
  * \param count number of elements to be reduced
  * \param enum_dtype the enumeration of data type, see rabit::engine::mpi::DataType in engine.h of rabit include
  * \param enum_op the enumeration of operation type, see rabit::engine::mpi::OpType in engine.h of rabit
  * \param prepare_fun Lazy preprocessing function, if it is not NULL, prepare_fun(prepare_arg)
- *                    will be called by the function before performing Allreduce, to intialize the data in sendrecvbuf_.
+ *                    will be called by the function before performing Allreduce, to initialize the data in sendrecvbuf_.
  *                     If the result of Allreduce can be recovered directly, then prepare_func will NOT be called
  * \param prepare_arg argument used to passed into the lazy preprocessing function
  */

rabit/include/rabit/internal/rabit-inl.h

@@ -102,7 +102,7 @@ inline void Reducer(const void *src_, void *dst_, int len, const MPI::Datatype &
 }
 }  // namespace op
 
-// intialize the rabit engine
+// initialize the rabit engine
 inline bool Init(int argc, char *argv[]) {
   return engine::Init(argc, argv);
 }

rabit/include/rabit/internal/socket.h

@@ -615,7 +615,7 @@ struct PollHelper {
   }
 
   /*!
-   * \brief peform poll on the set defined, read, write, exception
+   * \brief perform poll on the set defined, read, write, exception
    * \param timeout specify timeout in milliseconds(ms) if negative, means poll will block
    * \return
    */