Update results.md (dotnet#3969)

fixed some typos

Author: FoggyFinder

docs/fsharp/language-reference/results.md

@@ -47,17 +47,17 @@ type Request =
 let validateName req =
     match req.Name with
     | null -> Error "No name found."
-    | String.Empty -> Error "Name is empty."
+    | "" -> Error "Name is empty."
     | "bananas" -> Error "Bananas is not a name."
     | _ -> Ok req
 
 // Similarly, define some email validation logic.
 let validateEmail req =
     match req.Email with
     | null -> Error "No email found."
-    | String.Empty -> Error "Email is empty."
+    | "" -> Error "Email is empty."
     | s when s.EndsWith("bananas.com") -> Error "No email from bananas.com is allowed."
-    | _ -> OK req
+    | _ -> Ok req
 
 let validateRequest reqResult =
     reqResult 
@@ -67,16 +67,16 @@ let validateRequest reqResult =
 let test() = 
     // Now, create a Request and pattern match on the result.
     let req1 = { Name = "Phillip"; Email = "phillip@contoso.biz" }
-    let res1 = validateRequest (OK req1)
+    let res1 = validateRequest (Ok req1)
     match res1 with
-    | Ok req -> printfn "My request was valid! Name: %s Email %s" req1.Name req1.Email
+    | Ok req -> printfn "My request was valid! Name: %s Email %s" req.Name req.Email
     | Error e -> printfn "Error: %s" e
-    // Prints " "My request was valid!  Name: Phillip Email: phillip@consoto.biz"
+    // Prints: "My request was valid!  Name: Phillip Email: phillip@consoto.biz"
 
     let req2 = { Name = "Phillip"; Email = "phillip@bananas.com" }
-    let res2 = validateRequest (OK req2)
+    let res2 = validateRequest (Ok req2)
     match res2 with
-    | Ok req -> printfn "My request was valid! Name: %s Email %s" req1.Name req1.Email
+    | Ok req -> printfn "My request was valid! Name: %s Email %s" req.Name req.Email
     | Error e -> printfn "Error: %s" e
     // Prints: "Error: No email from bananas.com is allowed."