update doctest to qualify vectuptotupvec

Author: bgctw

src/util.jl

@@ -13,7 +13,8 @@ all components of the returned Tuple, also when there were not `missing` in `vec
 # Examples
 ```jldoctest; output=false
 vectup = [(1,1.01, "string 1"), (2,2.02, "string 2")] 
-vectuptotupvec_allowmissing(vectup) == ([1, 2], [1.01, 2.02], ["string 1", "string 2"])
+HybridVariationalInference.vectuptotupvec_allowmissing(vectup) == 
+  ([1, 2], [1.01, 2.02], ["string 1", "string 2"])
 # output
 true
 ```