Fix: Reduce the number of document ci attempts to avoid long ci running (#5097)

Co-authored-by: shuaills <shishuaiuoe@gmail.com>

docs/Makefile

@@ -23,7 +23,7 @@ compile:
 		parallel -0 -j3 --halt soon,fail=1 ' \
 		NB_NAME=$$(basename {}); \
 		START_TIME=$$(date +%s); \
-		retry --delay=0 --times=3 -- \
+		retry --delay=0 --times=2 -- \
 			jupyter nbconvert --to notebook --execute --inplace "{}" \
 			--ExecutePreprocessor.timeout=600 \
 			--ExecutePreprocessor.kernel_name=python3; \