docs: clarify PR branch is based on upstream/master-cann-ops-competitions-AtomGit

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已合并

docs: clarify PR branch is based on upstream/master #306

fuyangchenghu创建于 6月4日从fuyangchenghu/cann-ops-competitions： add-submit-code 合入到 cann/cann-ops-competitions： master

docs: clarify PR branch is based on upstream/master #306

已合并

fuyangchenghu创建于 6月4日

从fuyangchenghu/cann-ops-competitions add-submit-code合入到cann/cann-ops-competitions master