[shardformer] Run meaningful doc test

Author: duanjunwen

docs/source/en/features/zerobubble_pipeline_parallelism.md

@@ -235,4 +235,4 @@ Performance Benchmark
 ## API Reference
 {{ autodoc:colossalai.pipeline.schedule.zero_bubble_pp.ZeroBubbleVPipeScheduler }}
 
-<!-- doc-test-command: echo  -->
+<!-- doc-test-command: python -m pytest -s tests/test_pipeline/test_schedule/test_zerobubble_pp.py  -->

docs/source/zh-Hans/features/zerobubble_pipeline_parallelism.md

@@ -234,4 +234,4 @@ plugin = HybridParallelPlugin(
 ## API 参考
 {{ autodoc:colossalai.pipeline.schedule.zero_bubble_pp.ZeroBubbleVPipeScheduler }}
 
-<!-- doc-test-command: echo  -->
+<!-- doc-test-command: python -m pytest -s tests/test_pipeline/test_schedule/test_zerobubble_pp.py  -->