Do not use deprecated positioning in the code and examples

[penguinolog]

Deprecated, but still supported:

• "fixed left"
• "fixed right"
• "fixed top"
• "fixed bottom"

Checklist

• I've ensured that similar functionality has not already been implemented
• I've ensured that similar functionality has not earlier been proposed and declined
• I've branched off the master or python-dual-support branch
• I've merged fresh upstream into my branch recently
• I've ran tox successfully in local environment
• I've included docstrings and/or documentation and/or examples for my code (if this is a new feature)

[penguinolog]

type annotate supported (not add to docs, just simplify work with existing code)

[coveralls]

Pull Request Test Coverage Report for Build 8634468076

Details

• 41 of 43 (95.35%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.04%) to 74.685%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
urwid/widget/monitored_list.py	40	42	95.24%

Totals
Change from base Build 8595868168:	0.04%
Covered Lines:	9393
Relevant Lines:	12722

---

💛 - Coveralls

[wardi]

it we're breaking this into multiple lines there's room to use keyword args to make the parameters easier to understand

[penguinolog]

fixed

[penguinolog]

Stable doctests fail on python 3.11 linux.
Can not reproduce locally on ubuntu 23.10:

 ----------------------------------------------------------------------
Ran 420 tests in 5.439s

OK (skipped=8)

UP: reproduced with the last python 3.11 docker image.
Investigation points, that it's cpython regression from python/cpython#115392 fix in python/cpython#115458

[penguinolog]

override explicit to allow __code__ for doctests