docs(examples): remove deprecation warnings with export_to_dataframe

[ceberam]

The usage of TableItem.export_to_dataframe() without doc argument is deprecated. However, some documentation is still showing the usage of export_to_dataframe function without the doc argument.

Resolves #2633

Checklist:

• Documentation has been updated, if necessary.
• Examples have been added, if necessary.
• Tests have been added, if necessary.

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• title ~= ^(fix|feat|docs|style|refactor|perf|test|build|ci|chore|revert)(?:\(.+\))?(!)?:

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Related Documentation

Checked 3 published document(s) in 1 knowledge base(s). No updates required.

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[dolfim-ibm]

lgtm