Updated the correct links to the farmOS API documentation in ONBOARDING.md
Fixes #115
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Pull Request Description
Updated the correct links to the farmOS API documentation in ONBOARDING.md Fixes #115
Licensing Certification
FarmData2 is a Free Cultural Work and all accepted contributions are licensed as described in the LICENSE.md file. This requires that the contributor holds the rights to do so. By submitting this pull request I certify that I satisfy the terms of the Developer Certificate of Origin for its contents.