[FLINK-20474][core] fix cep docs bug of pattern contiguity.

[liuyongvs]

What is the purpose of the change

fix cep docs bug of pattern contiguity.

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? ( not documented)

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[liuyongvs]

hi @dawidwys , @dianfu could you have a look this?

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