Give more context for proposed updates

[jennybc]

This message and choice (from install_github() ...

> install_github("klutometis/roxygen")
Downloading GitHub repo klutometis/roxygen@master
Select package(s) to update

1:   pkgbuild (1.0.1        -> 1.0.2       ) [CRAN]
2:   ps       (1.1.0        -> 1.2.0       ) [CRAN]
3:   rlang    (c448185e2... -> 665b78c72...) [GitHub]
4:   None
5:   All

Enter one or more numbers separated by spaces, or an empty line to cancel
1: 

feels like it could provide a bit more context to aid in decision-making.

My understanding is that these upgrades are proposed because the source of my currently installed package (CRAN or GitHub) has a more recent version. Not necessarily because the upgrade is needed for the primary install, in the sense of a minimum required version.

What do you think of adding:

A later version of the following packages is available from the source of the local version, e.g., CRAN or GitHub.
Select package(s) to update

[ghost]

This issue was moved by jimhester to r-lib/remotes#211.

[lock]

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