Remove u string prefix from docs

[verhovsky]

I did a search and replace for u" and (?<!')\bu' and checked each case. I also updated some strings to include the character instead of \u and \x literals since that's what the Python 3 REPL does and I also noticed some literals in docstrings were not escaped correctly (you need to escape the backslash unless it's a r""" docstring, otherwise the docstring will contain the actual character instead of the literal)

[verhovsky]

It would be good to add doctest to babel to check that the REPL output in the examples actually matches what you get if you were to run the code, but I'm not going to work on that.

[akx]

It would be good to add doctest to babel to check that the REPL output in the examples actually matches what you get if you were to run the code, but I'm not going to work on that.

We do have that... https://github.com/python-babel/babel/blob/98b9562c05e5276038c27ec12c12f3e92dc027b6/conftest.py#L22-L24

[verhovsky]

I thought it would catch the incorrectly escaped strings but it turns out doctest thinks that

['E d.\\u2009–\\u2009', 'E d.M.']

and

['E d.\u2009–\u2009', 'E d.M.']

are the same, which is surprising because they obviously are not but they wont fix it https://github.com/python/cpython/issues/129257#issuecomment-2612251436

[akx]

@verhovsky Very sorry for the delay! Can you rebase this (to fix the setup.cfg conflict)?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.98%. Comparing base (de44e18) to head (17d20c8). Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1174   +/-   ##
=======================================
  Coverage   91.98%   91.98%           
=======================================
  Files          27       27           
  Lines        4693     4693           
=======================================
  Hits         4317     4317           
  Misses        376      376           

Flag	Coverage Δ
macos-14-3.10	91.02% <ø> (ø)
macos-14-3.11	90.96% <ø> (ø)
macos-14-3.12	91.17% <ø> (ø)
macos-14-3.13	91.17% <ø> (ø)
macos-14-3.8	90.89% <ø> (ø)
macos-14-3.9	90.95% <ø> (ø)
macos-14-pypy3.10	91.02% <ø> (ø)
ubuntu-24.04-3.10	91.05% <ø> (ø)
ubuntu-24.04-3.11	90.98% <ø> (ø)
ubuntu-24.04-3.12	91.19% <ø> (ø)
ubuntu-24.04-3.13	91.19% <ø> (ø)
ubuntu-24.04-3.8	90.91% <ø> (ø)
ubuntu-24.04-3.9	90.98% <ø> (ø)
ubuntu-24.04-pypy3.10	91.05% <ø> (ø)
windows-2022-3.10	91.04% <ø> (ø)
windows-2022-3.11	90.97% <ø> (ø)
windows-2022-3.12	91.19% <ø> (ø)
windows-2022-3.13	91.19% <ø> (ø)
windows-2022-3.8	91.01% <ø> (ø)
windows-2022-3.9	90.97% <ø> (ø)
windows-2022-pypy3.10	91.04% <ø> (ø)

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