Update conversions/binary_to_decimal.c

@return added 'a '

Co-authored-by: David Leal <[email protected]>

conversions/binary_to_decimal.c

@@ -51,7 +51,7 @@ uint16_t num_len(uintmax_t num)
 /**
  * @brief The `binary_decimal` function does the actual job of conversion
  * @param the number binary to be converted
- * @return decimal_number decimal representation of binary number
+ * @return decimal_number decimal representation of a binary number
  */
 uintmax_t binary_decimal(uintmax_t number)
 {