Improve type of fiscal year start date

[JoshuaBehrens]

The data that is returned from the sandbox areas is in the format YYYY-MM-DD. Therefore it is not a valid date-time regarding RFC3339. It is a RFC3339 full-date and should be defined as such. This improves compatibility to open api tools that interfere with this property.

[opbld31]

Docs Build status updates of commit e39ac4d:

✅ Validation status: passed

File	Status	Preview URL	Details
dynamics-nav/api-reference/v1.0/contracts/BCOAS1.0.yaml	✅Succeeded

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Note: If you changed an existing file name or deleted a file, broken links in other files to the deleted or renamed file are listed only in the full build report.

[opbld34]

Docs Build status updates of commit 7a64fbb:

✅ Validation status: passed

File	Status	Preview URL	Details
dynamics-nav/api-reference/v1.0/contracts/BCOAS1.0.yaml	✅Succeeded

For more details, please refer to the build report.

Note: If you changed an existing file name or deleted a file, broken links in other files to the deleted or renamed file are listed only in the full build report.

[opbld31]

Docs Build status updates of commit 22e86ec:

✅ Validation status: passed

File	Status	Preview URL	Details
dynamics-nav/api-reference/v1.0/contracts/BCOAS1.0.yaml	✅Succeeded

For more details, please refer to the build report.

Note: If you changed an existing file name or deleted a file, broken links in other files to the deleted or renamed file are listed only in the full build report.