Clarify on "Scanning" vs "Graph Creation"

The [Feature Overview](https://github.com/microsoft/component-detection#feature-overview) contains a table with "Scanning" and "Graph Creation" headers, but I'm having a hard time understanding what esp. "Scanning" means in this context, if not scanning for dependencies, which (to me) implies the creation of a dependency graph.

Or does "Scanning" mean that only direct dependencies are identified, but not transitive ones? Could you please clarify?

Start with the linked Feature Overview and inspect the table headings for “Scanning” and “Graph Creation.” Clarify what each term means, including whether Scanning covers direct or transitive dependencies. The documentation is done when the distinction and their relationship are explicit to readers.

Written by the indexing model from the issue text.