Missing `gi_suspended` coverage in inspect comments and `generator/coroutine` tests

[hyongtao-code]

Some inspect documentation and generator/coroutine tests do not reference or validate gi_suspended / cr_suspended, even though the attribute exists and is exposed.

This issue tracks adding minimal comments and test coverage for completeness.

Linked PRs

• gh-144085: Add gi_suspended to inspect comments and generator/coroutine tests #144086