doc/guide: do not advertise pkglint -Call anymore

This option was kind of useful when the -Cextra option still existed (up
to 2019-02-19). After that date, it only enabled checks for the pkgsrc
infrastructure files, inter-package checks, as well as other checks on
files unrelated to the current package. These checks tend to be more
confusing than being helpful when checking a single package. They are
still useful when checking the whole pkgsrc tree at once, but that's a
special case.

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