Update purple_contact_sort's documentation to say it returns < 0 and > 1

Review Request #2077 — Created Nov. 19, 2022 and submitted — Latest diff uploaded

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pidgin/pidgin
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It turns out that g_utf8_collate will return values other than -1, 0, and 1 on
BSD which broke the unit tests which were expecting -1 but got -25.

Ran the unit tests on FreeBSD and verified they passed.

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