[BUG] [Python] [Documentation] Incorrect supported library listed in Documentation for the python Generator

[adriantam]

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Description

The generated documentation in https://openapi-generator.tech/docs/generators/python/ is incorrect. In the documentation, it is listed that the library supports library template (sub-template) to use: asyncio, tornado, urllib3. However, the generator only supports urllib3 (https://github.com/OpenAPITools/openapi-generator/blob/fea42b547ed61dcfdfc479cab6f68a601ec5adde/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonClientCodegen.java#L202).

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