Issue: https://github.com/go-gitea/gitea/issues/9637
Changes introduced: I have clarified the problematic terms (owner and
parent) in all affected endpoints.
The changes were made to relevant:
- HTTP endpoint parameters' descriptions
- response/request models' fields
This MR is big, but most changes are the same. If you'd like me to break
this MR into several smaller ones, let me know :)
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Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
