bug#45238: The section [[info:guix#Invoking guix package]] contradicts itself

[Jorge P. de Morais Neto]

Hi.  The last paragraph of [[info:guix#Invoking guix package]] says:

    However, note that package transformations are lost when upgrading;
    to preserve transformations across upgrades, you should define your
    own package variant in a Guile module and add it to
    ‘GUIX_PACKAGE_PATH’ (*note Defining Packages::).

This contradicts the earlier information, in the same section, about
`guix package -u':

    When upgrading, package transformations that were originally applied
    when creating the profile are automatically re-applied (*note Package
    Transformation Options::).

Regards

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