chore(*): add mathlib4 synchronization comments (#19167)
Regenerated from the [port status wiki page](https://github.com/leanprover-community/mathlib/wiki/mathlib4-port-status).
Relates to the following files:
* `algebra.algebra.spectrum`
* `algebra.category.Module.algebra`
* `algebra.lie.free`
* `algebra.lie.normalizer`
* `algebra.lie.quotient`
* `algebra.lie.universal_enveloping`
* `algebra.order.complete_field`
* `algebra.order.interval`
* `algebra.star.order`
* `analysis.normed_space.enorm`
* `analysis.special_functions.integrals`
* `analysis.special_functions.non_integrable`
* `analysis.special_functions.polar_coord`
* `category_theory.monoidal.of_has_finite_products`
* `category_theory.monoidal.opposite`
* `category_theory.monoidal.skeleton`
* `category_theory.monoidal.types.coyoneda`
* `category_theory.preadditive.Mat`
* `data.rat.star`
* `data.real.pi.wallis`
* `field_theory.adjoin`
* `group_theory.schur_zassenhaus`
* `linear_algebra.eigenspace.basic`
* `linear_algebra.tensor_algebra.grading`
* `measure_theory.covering.besicovitch`
* `measure_theory.covering.besicovitch_vector_space`
* `measure_theory.function.jacobian`
* `measure_theory.integral.divergence_theorem`
* `measure_theory.integral.fund_thm_calculus`
* `measure_theory.measure.lebesgue.integral`
* `number_theory.ramification_inertia`
* `ring_theory.dedekind_domain.dvr`
* `ring_theory.dedekind_domain.pid`
* `ring_theory.discrete_valuation_ring.tfae`
* `ring_theory.polynomial.cyclotomic.basic`
* `ring_theory.witt_vector.basic`
* `ring_theory.witt_vector.is_poly`
* `ring_theory.witt_vector.mul_p`
* `ring_theory.witt_vector.teichmuller`
* `topology.algebra.continuous_affine_map`
* `topology.algebra.module.character_space`
* `topology.category.Compactum`
* `topology.continuous_function.units`
