Typing ' after a link (external or internal) should insert a single apostrophe.
Typing ' after a link instead inserts '' (when Auto pair brackets is on).
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There is a downside to using such “fancy” (typographically correct) apostrophes: if some Obsidian notes use the more common “programming” single quotes, searching text with apostrophes becomes cumbersome (as we don’t know which kind of apostrophe we should look for). It’s thus better to be consistent, and it’s easier to be consistent by using the usual single quotes.
Hopefully it’s not too hard to not double ' right after a link, for the Obsidian wizards.