Update relational-vs-nosql-data.md

[azarboon]

Summary

Firstly, I wonder why ACID has been only mentioned in this page but without any explanation or link for further read. I added a bit of information to disambiguate it a bit.

Secondly, "consistency" has different notions and means different things in ACID vs CAP: in short

consistency in the context of CAP means that all nodes store and provide the same data. For ACID, consistency means that internal rules within an individual node must apply across the board. For example, that all values in a column must be unique.

So, I've added a clarification to inform readers and prevent confusion.

Here you can find some books that backup this claim (You can Google to find more sources):

Database Internals - A Deep Dive Into How Distributed Data Systems Work page 218
Big Data SMACK - A Guide to Apache Spark, Mesos, Akka, Cassandra, and Kafka page 213

Also, I noticed some inconsistencies for the terms used or the way they are written. Changed them a bit to make the page more consistent.

Fixes #Issue_Number (if available)

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[azarboon]

I'm using corporate laptop so kindly please help me with linting.