Typo tolerance would have to be implemented using some distance calculation algorithm like the Levenshtein distance. I did consider this at first, but then I realized that most of the similar features in text editors and IDEs don't include this type of tolerance either. I can't tell for sure if this would impact the app's performance, but it wasn't scoped as part of the project (in terms of what GSoC refers to). We could consider it as part of a future direction tho, I did some research regarding this when I was scoping the proposal for the feature Quick navigation in DocC Render - #12 by sofiaromorales.
I see, that's an interesting observation, I'll be including that behavior in the feature, thanks!