coding: Documentation typo fix.

Change-Id: I6ca873b3decaf50e7b79b5ab2269919c862a4fe0
diff --git a/src/coding/gsm0503_coding.c b/src/coding/gsm0503_coding.c
index 1d06adb..2eb8cba 100644
--- a/src/coding/gsm0503_coding.c
+++ b/src/coding/gsm0503_coding.c
@@ -927,7 +927,7 @@
  *  \param[in] nbits number of bits in \a bursts
  *  \param usf_p unused argument ?!?
  *  \param[out] n_errors number of detected bit-errors
- *  \param[out] n_bits_total total number of dcoded bits
+ *  \param[out] n_bits_total total number of decoded bits
  *  \returns 0 on success; negative on error */
 int gsm0503_pdtch_egprs_decode(uint8_t *l2_data, const sbit_t *bursts, uint16_t nbits,
 	uint8_t *usf_p, int *n_errors, int *n_bits_total)