doc: minor nit in from-zero-to-hero guide

[falcon78921]

Signed-off-by: James McClune falcon78921@users.noreply.github.com

Checklist

• [ ] References issues, create if required
• [ ] Updates documentation if necessary
• [ ] Includes tests for new functionality or reproducer for bug

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- `jenkins run tumbleweed` - `jenkins run leap` - `jenkins run ubuntu`

[susebot]

Can one of the admins verify this patch?