[hotfix][docs] add missing output method in Context interface in the doc

[showuon]

What is the purpose of the change

1. Add the missing output method in ProcessWindowFunction#Context interface in the doc.
2. Fix typo in Chinese doc.

Brief change log

1. Add the missing output method in ProcessWindowFunction#Context interface in the doc.
2. Fix typo in Chinese doc.

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, Kubernetes/Yarn, 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)

[flinkbot]

CI report:

• d9fe71b Azure: SUCCESS
• 58b57ad Azure: PENDING

Bot commands

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• @flinkbot run azure re-run the last Azure build

[reswqa]

Thanks for the fix, LGTM % the commit message should be prefixed with [hotfix][docs] like the PR title.

[showuon]

the commit message should be prefixed with [hotfix][docs] like the PR title.

Done. Thanks.

[reswqa]

Thanks for the update, merging...