chore(*): add mathlib4 synchronization comments (#19057)
Regenerated from the [port status wiki page](https://github.com/leanprover-community/mathlib/wiki/mathlib4-port-status).
Relates to the following files:
* `algebra.category.Group.limits`
* `algebra.category.Module.kernels`
* `algebra.category.Mon.filtered_colimits`
* `algebra.char_p.mixed_char_zero`
* `algebraic_geometry.presheafed_space`
* `algebraic_geometry.projective_spectrum.topology`
* `analysis.calculus.fderiv.basic`
* `analysis.normed_space.star.mul`
* `analysis.special_functions.complex.circle`
* `analysis.special_functions.pow.nnreal`
* `linear_algebra.matrix.charpoly.basic`
* `linear_algebra.matrix.charpoly.coeff`
* `linear_algebra.matrix.charpoly.linear_map`
* `measure_theory.constructions.borel_space.basic`
* `measure_theory.constructions.borel_space.complex`
* `measure_theory.constructions.borel_space.continuous_linear_map`
* `measure_theory.constructions.polish`
* `measure_theory.function.ae_measurable_order`
* `measure_theory.function.ess_sup`
* `measure_theory.function.floor`
* `measure_theory.function.simple_func`
* `measure_theory.function.simple_func_dense`
* `measure_theory.function.special_functions.basic`
* `measure_theory.integral.lebesgue`
* `measure_theory.measure.regular`
* `measure_theory.measure.stieltjes`
* `number_theory.class_number.admissible_card_pow_degree`
* `ring_theory.graded_algebra.homogeneous_ideal`
* `ring_theory.graded_algebra.homogeneous_localization`
* `ring_theory.ideal.minimal_prime`
* `ring_theory.polynomial_algebra`
* `topology.algebra.module.locally_convex`
* `topology.continuous_function.bounded`
* `topology.sheaves.sheaf_condition.sites`
