fix: improve optional chaining in matchConfirmPassword function for better safety

Author: sonusindhu

src/app/examples/signal-form/example3/example3.component.ts

@@ -31,7 +31,7 @@ function matchConfirmPassword(path: FieldPath<string>) {
  validate(path, (confirmPassword) => {
  const field: any = confirmPassword.field;
 
- const password = field()?.['structure'].parent?.value()?.password;
+ const password = field()?.['structure']?.parent?.value()?.password;
 
  // if when condition is false, return null
  if(password !== confirmPassword.value()){

src/assets/examples/signal-forms/example3/example3.component.ts.md

@@ -29,7 +29,7 @@ function matchConfirmPassword(path: FieldPath<string>) {
  validate(path, (confirmPassword) => {
  const field: any = confirmPassword.field;
 
- const password = field()?.['structure'].parent?.value()?.password;
+ const password = field()?.['structure']?.parent?.value()?.password;
 
  // if when condition is false, return null
  if(password !== confirmPassword.value()){