fix: correct spelling errors in comments

[jannikbx]

Summary

Fixes three spelling errors in code comments and configuration documentation.

Changes

File	Correction
lib/private/Comments/Comment.php	writting → writing
config/config.sample.php	overriden → overridden (2 occurrences)
lib/public/BackgroundJob/JobStatus.php	sucessfully → successfully

All changes are limited to comments/documentation only — no functional impact.

AI Assistance

This contribution was made with the help of DeepSeek V4 Pro.

Assisted-by: DeepSeek:V4-Pro

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