Fix Documentation Path

[mcleo-d]

This PR resolves a current 404 error when navigating the following links by changing master to main/governance-documents ...

Markdown Change

By agreeing to the CSLA, participants agree to the terms of the following project policies:
* [Community Specification License](https://github.com/finos/standards-project-blueprint/blob/main/governance-documents/0._CS_Contributor_License_Agreement.md) (described above)
* [Community Specification Governance Policy](https://github.com/finos/standards-project-blueprint/blob/main/governance-documents/1._Community_Specification_License-v1.md) (setting out the project governance rules)
* [Community Specification Contribution Policy](https://github.com/finos/standards-project-blueprint/blob/main/governance-documents/6._Contributing.md) (setting out the workflow for making contributions to the project)
* [Community Specification Code of Conduct](https://github.com/finos/standards-project-blueprint/blob/main/governance-documents/8._Code_of_Conduct.md) (setting out the rules for appropriate participant behavior)

Preview

By agreeing to the CSLA, participants agree to the terms of the following project policies:

• Community Specification License (described above)
• Community Specification Governance Policy (setting out the project governance rules)
• Community Specification Contribution Policy (setting out the workflow for making contributions to the project)
• Community Specification Code of Conduct (setting out the rules for appropriate participant behavior)

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