Fixed typo, and switched to IList

Author: 7sharp9

src/fsharp/vs/Symbols.fs

@@ -1034,19 +1034,20 @@ and FSharpMemberOrFunctionOrValue(cenv, d:FSharpMemberOrValData, item) =
         | Some v -> Some v.Range
         | None -> base.DeclarationLocation 
 
-    member x.Overloads matchParamterNumber=
+    member x.Overloads matchParameterNumber =
         checkIsResolved()
         match d with
         | M m ->
             match item with
             | Item.MethodGroup (_name, methodInfos) ->
                 let methods =
-                    if matchParamterNumber then
+                    if matchParameterNumber then
                         methodInfos
                         |> List.filter (fun methodInfo -> not (methodInfo.NumArgs = m.NumArgs) )
                     else methodInfos
                 methods
                 |> List.map (fun mi -> FSharpMemberOrFunctionOrValue(cenv, M mi, item))
+                |> makeReadOnlyCollection
                 |> Some
             | _ -> None
         | _ -> None

src/fsharp/vs/Symbols.fsi

@@ -683,8 +683,8 @@ and [<Class>] FSharpMemberOrFunctionOrValue =
     member CurriedParameterGroups : IList<IList<FSharpParameter>>
 
     /// Gets the overloads for the current method
-    /// matchParamterNumber indicates whether to filter the overloads to match the number of parameters in the current symbol
-    member Overloads : bool -> FSharpMemberOrFunctionOrValue list option
+    /// matchParameterNumber indicates whether to filter the overloads to match the number of parameters in the current symbol
+    member Overloads : bool -> IList<FSharpMemberOrFunctionOrValue> option
 
     member ReturnParameter : FSharpParameter