chore(*): add mathlib4 synchronization comments (#19216)
Regenerated from the [port status wiki page](https://github.com/leanprover-community/mathlib/wiki/mathlib4-port-status).
Relates to the following files:
* `algebra.category.Mon.colimits`
* `algebra.category.fgModule.basic`
* `analysis.complex.upper_half_plane.basic`
* `analysis.inner_product_space.linear_pmap`
* `analysis.special_functions.gamma.beta`
* `analysis.special_functions.gamma.bohr_mollerup`
* `analysis.special_functions.gaussian`
* `category_theory.closed.ideal`
* `category_theory.monoidal.Bimod`
* `combinatorics.simple_graph.regularity.bound`
* `combinatorics.simple_graph.regularity.chunk`
* `combinatorics.simple_graph.regularity.increment`
* `combinatorics.simple_graph.regularity.lemma`
* `control.random`
* `geometry.manifold.complex`
* `geometry.manifold.mfderiv`
* `geometry.manifold.partition_of_unity`
* `linear_algebra.exterior_algebra.of_alternating`
* `logic.equiv.array`
* `number_theory.bertrand`
* `number_theory.legendre_symbol.gauss_eisenstein_lemmas`
* `number_theory.legendre_symbol.gauss_sum`
* `number_theory.legendre_symbol.jacobi_symbol`
* `number_theory.legendre_symbol.quadratic_char.gauss_sum`
* `number_theory.legendre_symbol.quadratic_reciprocity`
* `number_theory.sum_two_squares`
* `number_theory.zsqrtd.quadratic_reciprocity`
* `ring_theory.dedekind_domain.selmer_group`
* `ring_theory.witt_vector.frobenius`
* `ring_theory.witt_vector.identities`
* `ring_theory.witt_vector.init_tail`
* `ring_theory.witt_vector.verschiebung`
* `set_theory.game.basic`
* `set_theory.game.impartial`
* `set_theory.game.ordinal`
* `set_theory.surreal.basic`
* `testing.slim_check.gen`
* `testing.slim_check.sampleable`
* `testing.slim_check.testable`
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