Steps To Reproduce

Sagelib contains lots of references to sage -t for running tests, which no longer works in the meson build. Most of them are in documentation, but there are also some tests that need to be fixed. Notably, the failures summary after doctesting still mentions sage -t, even if tests are run via python -m sage.doctest

Expected Behavior

No mentions to sage -t

Actual Behavior

$ python -m sage.doctest --long sage/src/sage/doctest/test.py
[...]
----------------------------------------------------------------------
sage -t --long --warn-long 30.0 --random-seed=210309971544087718603108275738385607577 sage/src/sage/doctest/test.py  # 30 doctests failed
----------------------------------------------------------------------

Additional Information

No response

Environment

• OS: Arch Linux
• Sage Version: 10.7.beta0

Checklist

• I have searched the existing issues for a bug report that matches the one I want to file, without success.
• I have read the documentation and troubleshoot guide