generator docs: update slack example with real token

resolves https://github.com/asyncapi/generator/issues/1541

Summary by CodeRabbit

Documentation
- Improved and expanded instructions in the README for testing the Python WebSocket client, including detailed setup steps and Slack client usage examples.
- Enhanced clarity and formatting throughout the documentation.
Bug Fixes
- Corrected the import and usage of the Slack WebSocket client class in the example script.

Jun 24 '25 15:06 derberg

⚠️ No Changeset found

Latest commit: c37d33145dd0fc0b925e873b781dd7312c21d6e1

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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Jun 24 '25 15:06 changeset-bot[bot]

"""

Walkthrough

The changes update the Python WebSocket client template's README to provide clearer, step-by-step instructions for running the Slack client example, including credential handling, connection flow, and security considerations. Additionally, the Slack client example script is corrected to use the appropriate class name for instantiation.

Changes

Files	Change Summary
packages/templates/clients/websocket/python/README.md	Revised and expanded Slack example instructions, credential handling, security notes, formatting.
packages/templates/clients/websocket/python/example-slack.py	Fixed import and instantiation to use correct Slack client class name.

Assessment against linked issues

Objective (Issue #)	Addressed	Explanation
Make Slack example easy to run for anyone (#1541)	✅
Share credentials safely and document limitations (#1541)	✅
Provide step-by-step instructions for connection (#1541)	✅

Assessment against linked issues: Out-of-scope changes

No out-of-scope changes were found. """

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