fix typos

Author: ytdHuang

CHANGELOG.md

@@ -148,3 +148,4 @@ Release date: 2024-11-13
 [#408]: https://github.com/qutip/QuantumToolbox.jl/issues/408
 [#410]: https://github.com/qutip/QuantumToolbox.jl/issues/410
 [#411]: https://github.com/qutip/QuantumToolbox.jl/issues/411
+[#413]: https://github.com/qutip/QuantumToolbox.jl/issues/413

test/core-test/quantum_objects.jl

@@ -128,7 +128,7 @@
         ρ_ket = operator_to_vector(ρ)
         ρ_bra = ρ_ket'
         @test ρ_bra == Qobj(operator_to_vector(ρ.data)', type = OperatorBra)
-        @test ρ == vector_to_opeartor(ρ_ket)
+        @test ρ == vector_to_operator(ρ_ket)
         @test isket(ρ_ket) == false
         @test isbra(ρ_ket) == false
         @test isoper(ρ_ket) == false