updata encodec doc

Author: Rongkangqi

docs/CanaanK230/part3/07_CameraExperimentEncodingVideoStream.md

@@ -109,6 +109,9 @@ vi Makefile
 填入一下内容：
 
 ```
+include $(MPP_SRC_DIR)/userapps/sample/mpp.mk
+include $(MPP_SRC_DIR)/userapps/sample/rt-smart.mk
+
 CURRECT_DIR_NAME=$(shell basename `pwd`)
 LOCAL_SRC_DIR = $(shell pwd)
 BIN = $(MPP_SRC_DIR)/userapps/sample/elf/$(CURRECT_DIR_NAME).elf