Spellchecking for examples + Fix master CI (#812)

* Spellcheck examples as well

* Remove non-existent method

* Fix language

* Fix clippy `needless_borrow`

https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow

* Fix spellchecking for examples

* Add `block_timestamp` in `engine`

* Update examples/erc721/lib.rs

Co-authored-by: Robin Freyler <robin.freyler@gmail.com>

* Find solution for words which are non-existent

Co-authored-by: Robin Freyler <robin.freyler@gmail.com>
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