Fix docs

Author: Affie

docs/src/func_ref.md

@@ -44,6 +44,12 @@ Modules = [DistributedFactorGraphs]
 Pages = ["entities/DFGFactor.jl"]
 ```
 
+### Error Types
+```@autodocs
+Modules = [DistributedFactorGraphs]
+Pages = ["errors.jl"]
+```
+
 ## DFG Plots [GraphMakie.jl]
 
 ```@autodocs

src/Deprecated.jl

@@ -421,11 +421,6 @@ function fncStringToData(args...; kwargs...)
 end
 
 #TODO make sure getFactorOperationalMemoryType is obsolete
-"""
-    $(SIGNATURES)
-
-Method must be overloaded by the user for Serialization to work.  E.g. IncrementalInference uses `CommonConvWrapper <: FactorSolverCache`.
-"""
 function getFactorOperationalMemoryType(dummy)
     return error(
         "Please extend your workspace with function getFactorOperationalMemoryType(<:AbstractParams) for your usecase, e.g. IncrementalInference uses `CommonConvWrapper <: FactorSolverCache`",