[hotfix][docs] Fix FileSource monitor_continuously spelling

[fallintoplace]

What is the purpose of the change

Four PyFlink examples call monitor_continously, which does not exist. The correct FileSourceBuilder method is monitor_continuously. Users copying these examples receive an AttributeError.

Brief change log

• Correct the method name in the English and Chinese FileSystem documentation.
• Correct the method name in the English and Chinese text-file documentation.

Verifying this change

The documentation builds successfully with Hugo. The incorrect spelling no longer occurs in the English or Chinese documentation.

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

• Dependencies: no
• Public API: no
• Serializers: no
• Runtime per-record code paths: no
• Deployment or recovery: no
• S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no

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Was generative AI tooling used to co-author this PR?

• No

[flinkbot]

CI report:

• b2b3600 Azure: SUCCESS

Bot commands

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

[spuru9]

Make sense. Cross checked with the code.