doc: spelling check doxygen comments include/

fix misspellings found in doxygen comments used for API docs

Signed-off-by: David B. Kinder <david.b.kinder@intel.com>

include/kernel.h

diff --git a/include/kernel.h b/include/kernel.h
index 826052e..eb864e7 100644
--- a/include/kernel.h
+++ b/include/kernel.h
@@ -1139,7 +1139,7 @@
 /**
  * @brief Enable clock always on in tickless kernel
  *
- * This routine enables keepng the clock running when
+ * This routine enables keeping the clock running when
  * there are no timer events programmed in tickless kernel
  * scheduling. This is necessary if the clock is used to track
  * passage of time.
@@ -1159,7 +1159,7 @@
 /**
  * @brief Disable clock always on in tickless kernel
  *
- * This routine disables keepng the clock running when
+ * This routine disables keeping the clock running when
  * there are no timer events programmed in tickless kernel
  * scheduling. To save power, this routine should be called
  * immediately when clock is not used to track time.