Stated Sauron versions in examples under docs

Hi, I'm just starting with sauron and was looking at basic examples. _getting-started.md_ and _intermediate-example.md_ have Sauron versions 0.60.0 and 0.50.0 cited for Cargo.toml respectively, while the code seems to work for 0.70.0. This seems consistant with the **Migration guide from 0.60.0 to 0.61.0** in _migration_guide.md_ differences.