Azure samples not getting rendered correctly

[vrdmr]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [ ] bug report -> please search issues before submitting
- [ ] feature request
- [x] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Minimal steps to reproduce

In OPS, the following error shows up for the samples from this repo

Any log messages given by the failure

Link to OPS build of the samples documentation - here

Error	User	ViolateSchema	Azure-Samples/blockchain/blockchain-samples/index.yml

Schema validation failed. Please validate the file and make sure it conforms to schema 'Sample' (https://static.docs.com/ui/latest/schemas/Sample.schema.json): Value "rest" is not defined in enum. Path 'languages[4]'.		06/01/2020 06:30:09

Expected/desired behavior

I check the documentation guide to make sure rest was declared correctly, but the issue still exists.

OS and Version?

Windows 7, 8 or 10. Linux (which distribution). macOS (Yosemite? El Capitan? Sierra?)

Versions

Mention any other details that might be useful

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