docs: Fix a few typos

[timgates42]

There are small typos in:

• Levenshtein/_levenshtein.c

Fixes:

• Should read through rather than throught.
• Should read continuing rather than contiuning.
• Should read extremely rather than extermely.
• Should read completeness rather than completenes.
• Should read availability rather than avaliability.

Semi-automated pull request generated by
https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md

[maxbachmann]

@timgates42 this went horribly wrong. Apparently your tool does not properly support forked repos.

[timgates42]

Thanks @maxbachmann cleaned it up manually - I noticed even the github command line tool struggled and seemed to pick https://github.com/ztane/python-Levenshtein as the original fork for some reason - anyway I manually added the miohtama remote and rebased it.

[timgates42]

Ah I think this repo should be archived, I notice the ztane repo is effectively the best fork to use, my tool would skip over this and apply to ztane if this repo was archived as this was handed over but I note even the ztane repo is looking for a new maintainer anyway.

[maxbachmann]

Yes I do maintain a fork here: https://github.com/maxbachmann/Levenshtein. I removed the fork connection exactly to avoid issues like this.