[doc] update rst (#470)

* update rst

* remove empty rst

docs/colossalai/colossalai.utils.rst

@@ -7,9 +7,13 @@ colossalai.utils
 .. toctree::
    :maxdepth: 2
 
+   colossalai.utils.commons
    colossalai.utils.data_sampler
    colossalai.utils.gradient_accumulation
+   colossalai.utils.memory_tracer
    colossalai.utils.multi_tensor_apply
+   colossalai.utils.profiler
+   colossalai.utils.tensor_detector
 
 
 .. toctree::
@@ -20,4 +24,5 @@ colossalai.utils
    colossalai.utils.common
    colossalai.utils.cuda
    colossalai.utils.memory
+   colossalai.utils.moe
    colossalai.utils.timer