Fix typo (from Vim downstream)

[gwymor]

Change copied from downstream Vim commit dbf749b (runtime: Fix more typos (#13354), 2023-10-16).

Co-authored-by: Viktor Szépe viktor@szepe.net

[xuhdev]

Are you sure help tags are supposed to be tracked by git? My understanding of help tags is that they should be generated by the user. In case of the vim runtime bundled with Vim, the help tags may be pregenerated so that users can use them sitewide.

[gwymor]

I am not very aware of what the convention is, other than that Vim itself keeps tags files committed to the repo. I looked at a few other extensions and they do not, though. I can drop the tags change from this PR leaving only the typo fix if you prefer.

[xuhdev]

Yes, please.

[xuhdev]

Thanks!