Fix errors in “CSV Formats" page

As shown in the picture,I find some errors in Format Options.There are also some punctuation errors that can be corrected together.

The page url is https://nightlies.apache.org/flink/flink-docs-master/zh/docs/connectors/table/formats/csv/

The markdown file is located in docs/content.zh/docs/connectors/table/formats/csv.md