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eslint: Update spellchecker and fix issues

The performance issues with the spellcheck plugins were resolved
https://github.com/aotaduy/eslint-plugin-spellcheck/issues/44

This commit updates the dependency to the latest version and fixes
several spelling issues.

1410 of 2952 branches covered (47.76%)

Branch coverage included in aggregate %.

4802 of 6570 relevant lines covered (73.09%)

35.86 hits per line