Update example to Vaadin 8 (#9260)

Replaced Result<String> with ValidationResult.
Replaced variable input by value.
Removed first phrase after example since it does not make sense anymore.

1 files changed, 5 insertions, 7 deletions

diff --git a/documentation/components/components-fields.asciidoc b/documentation/components/components-fields.asciidoc
index c963c96ebe..1415f98e73 100644
--- a/documentation/components/components-fields.asciidoc
+++ b/documentation/components/components-fields.asciidoc
@@ -156,20 +156,18 @@ whether or not the given input was valid.
 ----
 class MyValidator implements Validator<String> {
     @Override
-    public Result<String> apply(String value, ValueContext context) {
-        if(input.length() == 6) {
-            return Result.ok(input);
+    public ValidationResult apply(String value, ValueContext context) {
+        if(value.length() == 6) {
+            return ValidationResult.ok();
         } else {
-            return Result.error(
+            return ValidationResult.error(
                 "Must be exactly six characters long");
         }
     }
 }
 ----
 
-Because [methodname]#Result.ok# takes the valid value as an argument, a validator
-can also do some sanitization on valid inputs, such as removing leading and
-trailing whitespace from a string. Since [interfacename]#Validator# is a functional
+Since [interfacename]#Validator# is a functional
 interface, you can often simply write a lambda expression instead of a full class
 declaration. There is also an [methodname]#withValidator# overload that creates a
 validator from a boolean function and an error message.