chore(*): add mathlib4 synchronization comments (#18634)
Regenerated from the [port status wiki page](https://github.com/leanprover-community/mathlib/wiki/mathlib4-port-status).
Relates to the following files:
* `algebra.lie.subalgebra`
* `category_theory.limits.shapes.kernel_pair`
* `category_theory.monoidal.preadditive`
* `category_theory.preadditive.single_obj`
* `linear_algebra.sesquilinear_form`
* `number_theory.padics.padic_val`
* `ring_theory.localization.fraction_ring`
* `topology.algebra.uniform_ring`
* `topology.covering`
* `topology.fiber_bundle.basic`
Author
github-actions[bot]
