🎉 Source Mixpanel: fix of documentation links

[roman-romanov-o]

What

Minor fix of broken link to Mixpanel Documentation

🚨 User Impact 🚨

No user impact

Pre-merge Checklist

Expand the relevant checklist and delete the others.

New Connector

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• Code reviews completed
• Documentation updated
  • Connector's README.md
  • Connector's bootstrap.md. See description and examples
  • docs/SUMMARY.md
  • docs/integrations/<source or destination>/<name>.md including changelog. See changelog example
  • docs/integrations/README.md
  • airbyte-integrations/builds.md
• PR name follows PR naming conventions

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Updating a connector

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• Unit & integration tests added and passing. Community members, please provide proof of success locally e.g: screenshot or copy-paste unit, integration, and acceptance test output. To run acceptance tests for a Python connector, follow instructions in the README. For java connectors run ./gradlew :airbyte-integrations:connectors:<name>:integrationTest.
• Code reviews completed
• Documentation updated
  • Connector's README.md
  • Connector's bootstrap.md. See description and examples
  • Changelog updated in docs/integrations/<source or destination>/<name>.md including changelog. See changelog example
• PR name follows PR naming conventions

Airbyter

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• Create a non-forked branch based on this PR and test the below items on it
• Build is successful
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• /test connector=connectors/<name> command is passing
• New Connector version released on Dockerhub and connector version bumped by running the /publish command described here

Connector Generator

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• Documentation which references the generator is updated as needed

Tests

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Integration

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Acceptance

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