Small changes to documentation

[ChristianZimpelmann]

Fix some typos in documentation and docstrings

Also two more comments/questions:

• If I am not mistaken, the description of pounders isn't correct. The criterion function seems to be expected as just returning value

 ```{eval-rst}
.. dropdown:: pounders

    .. code-block::

        "pounders"

    Minimize a function using the POUNDERS algorithm.

    POUNDERs (:cite:`Benson2017`, :cite:`Wild2015`, `GitHub repository
    <https://github.com/erdc/petsc4py>`_)
[]
    The criterion function :func:`func` should return a dictionary with the following
    fields:

    1. ``"value"``: The sum of squared (potentially weighted) errors.
    2. ``"root_contributions"``: An array containing the root (weighted) contributions.
    

• The graph in how_to_algorithm_selection mentions scipy_ls_dogleg, but this algorithm doesn't seem to be supported, yet.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files with missing lines	Coverage Δ
src/optimagic/optimizers/_pounders/gqtpar.py	90.54% <ø> (ø)
...timagic/optimizers/_pounders/pounders_auxiliary.py	97.32% <ø> (ø)
src/optimagic/optimizers/pounders.py	92.56% <ø> (ø)

... and 1 file with indirect coverage changes

[janosg]

Thanks, I'll have a look at your comments. The description of the pounders objective function is definitely outdated. I'll check about scipy_ls_dogleg.

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[janosg]

The correct name of the algorithm is scipy_ls_dogbox because it is a dogleg algorithm with support for box constraints. I adjusted the decision tree.

[janosg]

Thanks a lot for the PR!