[CentOS-docs] Clarification in HowTos/MigrationGuide page

[Alain Reguera Delgado]

> On 9/10/07, Phil Schaffner <Philip.R.Schaffner at nasa.gov> wrote:
...
> How does this look?
>
>
>         Always beware when using/mixing 3rd-party repos. The yum
>         protectbase or priorities plugins are your friends. Although
>         both can be used together, the priorities plugin provides more
>         functionality and using protectbase is unnecessary if the
>         priorities plugin is configured properly. See
>         PackageManagement/Yum/ProtectBase and
>         PackageManagement/Yum/Priorities.
>
> Phil

Hi Phil, thanks for taking the time ...

It looks nice to me ... and what do you think if we also add Daniel's
comment somewhere ... maybe like a reference, quote, note ...

Cheers,

al.