docs: yaml cheatsheet for advanced syntax (#2329)

official spec linked at top of page is inaccessible for most readers
(it's too dry and academic)
so added famous cheatsheet (heavily promoted on StackOverflow)
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lonix1 2023-08-28 16:24:56 +02:00 committed by GitHub
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@ -88,3 +88,8 @@ steps:
- echo echo from second step
- <<: *post_cmds
```
## References
- [Official specification](https://yaml.org/spec/1.2.2/#3222-anchors-and-aliases)
- [Cheatsheet](https://learnxinyminutes.com/docs/yaml)