docs(exercises): add information for collections

Add additional further information for collections
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vincenterc 2021-05-19 07:30:59 +08:00 committed by GitHub
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@ -20,3 +20,4 @@ structures that are used very often in Rust programs:
## Further information
- [Storing Lists of Values with Vectors](https://doc.rust-lang.org/stable/book/ch08-01-vectors.html)
- [Storing Keys with Associated Values in Hash Maps](https://doc.rust-lang.org/stable/book/ch08-03-hash-maps.html)