Update EXAMPLES.rdoc to fix Google example

Very strange that it was only when I changed the key to :id that it worked and did a "pp a", otherwise copying the code and running it initially gave a "<main>': undefined method `q=' for nil:NilClass (NoMethodError)"

Changed page.form_with(:name => 'gbqf') to page.form_with(:id => 'gbqf')

This could also have educational benefits as no example in the document using the ID key as a parameter.