Update 12.temporary_ins/40.classical-mechanics/30.n3/75.mechanical-waves/20.overview/cheatsheet.fr.md

Update 12.temporary_ins/40.classical-mechanics/30.n3/70.mechanical-oscillator /20.overview/cheatsheet.fr.md

Update 12.temporary_ins/40.classical-mechanics/30.n3/65.shocks-and-conservation-laws/20.overview/cheatsheet.fr.md

Update 12.temporary_ins/90.electromagnetism-in-vacuum/10.maxwell-equations/20.overview/cheatsheet.fr.md

Update 12.temporary_ins/90.electromagnetism-in-vacuum/10.maxwell-equations/20.overview/cheatsheet.fr.md