Adds description of length parameter for writeRegion() in both header locations where it was missing.

Author: edspark

src/sfeTk/sfeTkIBus.h

@@ -107,6 +107,7 @@ class sfeTkIBus
     /**--------------------------------------------------------------------------
      *  @brief Send an array of data to the device.
      *  @param data Data to write.
+     *  @param length - length of data.
      *
      *  @retval sfeTkError_t -  kSTkErrOk on successful execution.
      *

src/sfeTkArdI2C.h

@@ -133,6 +133,7 @@ class sfeTkArdI2C : public sfeTkII2C
         @note sfeTkIBus interface method
 
         @param data Data to write.
+        @param length - length of data
 
         @retval returns  kStkErrOk on success
     */