Exclude pexel links from checking as they 403 requests from within actions

Author: blowdart

samples/Samples.Video/readme.md

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 [Drone video](https://www.pexels.com/video/drone-footage-of-the-beach-8150514/) by [ArtHouse Studio](https://www.pexels.com/@arthousestudio/)
 under the Pexels' [Free to Use](https://www.pexels.com/license/) license.
 
 [Flowers video](https://www.pexels.com/video/tiny-white-flowers-1494295/) by [Chris G](https://www.pexels.com/@gochrisgoxyz/)
 under the Pexels' [Free to Use](https://www.pexels.com/license/) license.
+
+<!-- markdown-link-check-enable -->