Adjust codespell config + make it fix few typos which sneaked in since addition of codespell support (#4857)

Now that my colleague just posted a wonderful blog post https://blog.datalad.org/posts/forgejo-runner-podman-deployment/ on forgejo runner, some time I will try to add that damn codespell action to work on CI here ;)  meanwhile some typos managed to sneak in and this PR should address them (one change might be functional in a test -- not sure if would cause a fail or not)

### Release notes

- [ ] I do not want this change to show in the release notes.
- [ ] I want the title to show in the release notes with a link to this pull request.
- [ ] I want the content of the `release-notes/<pull request number>.md` to be be used for the release notes instead of the title.

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/4857
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: Yaroslav Halchenko <debian@onerussian.com>
Co-committed-by: Yaroslav Halchenko <debian@onerussian.com>

modules/structs/repo.go

@@ -317,7 +317,7 @@ const (
 )
 
 // Name represents the service type's name
-// WARNNING: the name have to be equal to that on goth's library
+// WARNING: the name have to be equal to that on goth's library
 func (gt GitServiceType) Name() string {
 	return strings.ToLower(gt.Title())
 }