Update src/config.jl

Author: ChrisRackauckas

src/config.jl

@@ -24,9 +24,12 @@ Tag(::Nothing, ::Type{V}) where {V} = nothing
     tagcount(Tag{F1,V1}) < tagcount(Tag{F2,V2})
 end
 
-# SmallTag is similar to a Tag, but carries just a small UInt64 hash, instead
-# of the full type, which makes stacktraces / types easier to read while still
-# providing good resilience to perturbation confusion.
+"""
+    SmallTag{Hash}
+    
+SmallTag is similar to a Tag, but carries just a small UInt64 hash, 
+instead of the full type, which makes stacktraces / types easier to 
+read while still providing good resilience to perturbation confusion.
 struct SmallTag{H}
 end