rename to for clarity (#9783)

Co-authored-by: Xurshudyan <v.khurshudyan@aico.swiss>

Author: xurshudyan

validation.md

@@ -1934,7 +1934,7 @@ Alternatively, you may use the `exclude_unless` rule to not validate a given fie
 
 In some situations, you may wish to run validation checks against a field **only** if that field is present in the data being validated. To quickly accomplish this, add the `sometimes` rule to your rule list:
 
-    $v = Validator::make($data, [
+    $validator = Validator::make($data, [
         'email' => 'sometimes|required|email',
     ]);