Add `squash_commit_template` to API `edit project` documentation
What does this MR do and why?
Fixes #348369
In MR !74340 (merged) we've added field squash_commit_template
to project.
It can be both fetched and updated through REST API, but it was missing in "Edit project" section, suggesting that it can't be updated through API.
I've confirmed that the field can be updated through API, so there's no reason to skip it in "Edit project" section.
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