Notes on improving the documentation

[jodemaey]

• There was a confusion with the problems created by Python 3.14 multiprocessing switching its default start method for processes. This need to be removed (or modified):

[jodemaey]

• A comment on the guarding of mutliprocessed Python 3.14 main script should be added somewhere and examples must be modified to include this guarding.

[jodemaey]

• The signature of the functions returning the tendencies and the Jacobian should be documented (in an info box).

[jodemaey]

Interest of setting the timeout to True should be stated in the documentation.
Maybe there:

or in the trick section ?

[jodemaey]

In the reference of the SingleArithmeticTerm, it is noted that the field $\psi$ on which the term is acting is the field solution of the equation:

but this is not always the case, so this should be changed.

In addition, this part also should be changed accordingly:

[jodemaey]

$J$ should be bold