Update relational-vs-nosql-data.md #43234
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Summary
The page mainly explains CAP theorem and just briefly mentions PACELC theorem and leaves it to reader to pursue it further. I'm afraid that's not how it should be. Marc Brooker is one of thought leaders in database field. In this blog post, he explains why CAP theorem is outdated a bit, and it's relevant for intermittent environments such as IoT and for distributed environments, PACELC theorem should be considered, instead. I've made an edit.
Fixes #Issue_Number (if available)
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