chore(*): add mathlib4 synchronization comments (#19196)
Regenerated from the [port status wiki page](https://github.com/leanprover-community/mathlib/wiki/mathlib4-port-status).
Relates to the following files:
* `algebra.category.BoolRing`
* `algebra.continued_fractions.computation.approximation_corollaries`
* `category_theory.monoidal.internal.functor_category`
* `field_theory.galois`
* `field_theory.minpoly.is_integrally_closed`
* `field_theory.primitive_element`
* `linear_algebra.matrix.ldl`
* `number_theory.diophantine_approximation`
* `number_theory.pell`
* `number_theory.primes_congruent_one`
* `order.category.FinBoolAlg`
* `probability.kernel.composition`
* `probability.kernel.cond_cdf`
* `probability.kernel.invariance`
* `ring_theory.polynomial.cyclotomic.eval`
* `ring_theory.polynomial.cyclotomic.expand`
* `ring_theory.polynomial.cyclotomic.roots`
* `ring_theory.polynomial.gauss_lemma`
* `ring_theory.polynomial.selmer`
* `ring_theory.ring_hom.finite_type`
* `ring_theory.roots_of_unity.minpoly`
* `topology.category.UniformSpace`
* `topology.continuous_function.zero_at_infty`
* `topology.sheaves.operations`
