Improve article "Parts and Steps"
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Issue body
### Request type
Enhancement
### What needs to get done
This is a request to improve the [Parts and Steps](https://documentation.ubuntu.com/rockcraft/en/latest/reference/parts_steps/) article.
The following points are not clear for a new rock developer:
1. `craft-parts` in the first phrase. Are we talking about [Parts](https://documentation.ubuntu.com/rockcraft/en/latest/explanation/parts/), or is this a new concept?
2. The word _project_ in the article is generic and is not clear in this context. The reader would not know if we’re talking about a generic software project, or if this is a concept related to rocks or rockcraft.
Suggestions:
1. If `craft-parts` means [Parts](https://documentation.ubuntu.com/rockcraft/en/latest/explanation/parts/), link to it. Else, provide more information.
2. Clarify what _project_ is. Is this a term we use when building rocks?
### Documentation location
https://documentation.ubuntu.com/rockcraft/en/latest/reference/parts_steps/
### Additional information
_No response_
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