[hotfix][python][docs]Fix wrong example code in Python REPL and wrong table plan in table/common page

[HuangXingBo]

What is the purpose of the change

Fix wrong example code in Python REPL and wrong table plan in table/common page

Brief change log

• Correct example code in python_shell.md/python_shell.zh.md
• Correct table plan in common.md/common.zh.md

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

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

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[flinkbot]

CI report for commit 8d45d83: FAILURE Build

[dianfu]

@HuangXingBo Thanks a lot for the PR. The changes LGTM. +1 from my side.

[flinkbot]

CI report for commit 59c41a2: FAILURE Build

[WeiZhong94]

@HuangXingBo Thanks for your pull request! LGTM and +1 from my side.