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docs(exercises): updated all exercises readme files

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all exercises readme files now have a unified structure and a description
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exercises/variables/README.md
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### Variables
# Variables
Here you'll learn about simple variables.
In Rust, variables are immutable by default.
When a variable is immutable, once a value is bound to a name, you can’t change that value.
You can make them mutable by adding mut in front of the variable name.
#### Book Sections
## Further information
- [Variables and Mutability](https://doc.rust-lang.org/book/ch03-01-variables-and-mutability.html)