I've just browsed that page, and I don't see the word "err" being mentioned anywhere at all, so I have nothing to fix.

The current docs only mention err in the delta files for 5.9.x:

perl-git/pod > grep -w err *
perl590delta.pod:It has a low-precedence counterpart, C<err>, which ha
+s the same precedence
perl593delta.pod:(adds a C<say> built-in function), and C<err> (adds a
+n C<err> keyword).
perl593delta.pod:Note that C<err> low-precedence defined-or operator u
+sed to be enabled by
perldebtut.pod: DM<3>X ~err
perlhack.pod:documented. If you are going to err, it is better to err 
+on the side of
perltodo.pod:    errno_t err = fopen_s(&f, __FILE__, "r");
perl-git/pod >
[download]

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