Issue on page /chapter4/solvers.html

[gerlja]

Dear Mr Dokken,

I noticed that the link to the PETSc documentation doesn't work. It's in the paragraph right below the headline "Choosing a linear solver and preconditioner".

Best regards,
Jonathan

[jorgensd]

Should be:
https://petsc.org/release/manual/ksp/#tab-kspdefaults
and
https://petsc.org/release/manual/ksp/#tab-pcdefaults
with the new webpage layout of petsc