Use fleet slug instead of fleet name for examples

[otaviojacobi]

Change-type: patch

---

Please make sure to read the CONTRIBUTING document before opening the PR for relevant information on contributing to the documentation. Thanks!

[vipulgupta2048]

Thanks for suggesting this @otaviojacobi Would recommend that we replace myuser as the org name with slugs like org or myorg to make it explicitly clear what that the value here means the organization slug. It doesn't mean username here but on the first read, I understood it like that.