chore(*): add mathlib4 synchronization comments (#19171)
Regenerated from the [port status wiki page](https://github.com/leanprover-community/mathlib/wiki/mathlib4-port-status).
Relates to the following files:
* `algebra.lie.cartan_subalgebra`
* `algebra.lie.nilpotent`
* `analysis.ODE.picard_lindelof`
* `analysis.calculus.affine_map`
* `analysis.complex.abs_max`
* `analysis.complex.cauchy_integral`
* `analysis.complex.liouville`
* `analysis.complex.locally_uniform_limit`
* `analysis.complex.phragmen_lindelof`
* `analysis.complex.removable_singularity`
* `analysis.complex.schwarz`
* `analysis.convex.measure`
* `analysis.fourier.fourier_transform`
* `analysis.normed_space.add_torsor_bases`
* `analysis.normed_space.continuous_affine_map`
* `analysis.special_functions.improper_integrals`
* `analysis.special_functions.stirling`
* `analysis.special_functions.trigonometric.euler_sine_prod`
* `analysis.sum_integral_comparisons`
* `category_theory.closed.cartesian`
* `category_theory.closed.types`
* `category_theory.closed.zero`
* `category_theory.monoidal.Mod_`
* `data.real.pi.bounds`
* `data.vector3`
* `field_theory.fixed`
* `field_theory.is_alg_closed.basic`
* `field_theory.normal`
* `measure_theory.group.geometry_of_numbers`
* `measure_theory.group.integration`
* `measure_theory.integral.circle_integral`
* `measure_theory.integral.circle_transform`
* `measure_theory.integral.exp_decay`
* `measure_theory.integral.integral_eq_improper`
* `measure_theory.integral.layercake`
* `number_theory.bernoulli_polynomials`
* `probability.kernel.basic`
* `topology.category.Profinite.cofiltered_limit`
