chore(*): add mathlib4 synchronization comments (#18793)
Regenerated from the [port status wiki page](https://github.com/leanprover-community/mathlib/wiki/mathlib4-port-status).
Relates to the following files:
* `algebra.category.Module.basic`
* `algebra.linear_recurrence`
* `algebra.order.chebyshev`
* `algebra.order.to_interval_mod`
* `algebraic_topology.simplicial_object`
* `analysis.convex.extrema`
* `analysis.convex.slope`
* `analysis.normed.order.basic`
* `analysis.normed_space.basic`
* `category_theory.graded_object`
* `computability.encoding`
* `geometry.manifold.charted_space`
* `linear_algebra.free_algebra`
* `linear_algebra.quotient_pi`
* `ring_theory.polynomial.eisenstein.basic`
* `topology.category.Top.adjunctions`
* `topology.category.Top.basic`
