Fixed typo: 'lenght' in ns_crc.h

Note that the word 'lenght' is wrong,
so that 'lenght' should been replaced with 'length'.

Author: DavidLin1577

source/Service_Libs/utils/ns_crc.h

@@ -31,7 +31,7 @@ uint16_t crc16_ccitt(uint8_t *message, int nBytes);
 
 /**
  *  @param data         data which crc will be calculate
- *  @param data_length  Lenght of data pointer
+ *  @param data_length  Length of data pointer
  *  @param polynomial   Polynomial which will be used to calculate CRC, POLYNOMIAL_CRC15_CCIT, POLYNOMIAL_CRC15_ANSI
  *  @return Calculated 16bit CRC value
  */