Remaining incorrect link renderings

### Description of the modifications

Some internal and external links don't render correctly. The references are added in the next section.

### Useful links and references

- [ ] ``psf``: https://github.com/ansys/pymapdl/pull/3750#discussion_r2052547706
- supported structural element
- psf_labels_fn_2
- [ ] ``atan``: https://github.com/ansys/pymapdl/pull/3892/files/3d97e2f514b17ea6d143995d32ec52a02cfc43b3#r2075103122
- See `POST26 - Data Operations \n `_: wrong rendering
- [ ] ``abs``: https://github.com/ansys/pymapdl/pull/3892#discussion_r2075109150
- in the `Mechanical APDL Theory Reference \n `_ : wrong rendering

No source file, test, or entry point is identified. Start by tracing how the converter renders the referenced `psf`, `atan`, and `abs` links, reproduce each incorrect result, and verify that all three internal or external links render correctly.

Written by the indexing model from the issue text.