SemOptimizer{E}: remove docstring

Author: Alexey Stukalov

src/types.jl

@@ -79,11 +79,6 @@ end
 Base.:*(x::SemWeight{Nothing}, y) = y
 Base.:*(x::SemWeight, y) = x.w * y
 
-"""
-Supertype of all objects that can serve as the `optimizer` field of a SEM.
-Connects the SEM to its optimization backend and controls options like the optimization algorithm.
-If you want to connect the SEM package to a new optimization backend, you should implement a subtype of SemOptimizer.
-"""
 abstract type SemOptimizer{E} end
 
 """