[nfc] fix typo colossalai/zero

[digger-yu]

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[nfc] fix typo colossalai/zero
detail info
modified: colossalai/initialize.py
modified: colossalai/zero/gemini/memory_tracer/utils.py
modified: colossalai/zero/legacy/init_ctx/init_context.py
modified: colossalai/zero/legacy/sharded_model/sharded_model_v2.py
modified: colossalai/zero/low_level/_utils.py
modified: colossalai/zero/low_level/low_level_optim.py

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