Fix some documentation errors

README.rdoc

@@ -163,8 +163,8 @@ automatically follows any redirects, and submits forms associated with buttons.
     click_link('id-of-link')
     click_link('Link Text')
     click_button('Save')
-    click('Link Text') # Click either a link or a button
-    click('Button Value')
+    click_link_or_button('Link Text')
+    click_link_or_button('Button Value')
 
 === Interacting with forms
 
@@ -189,7 +189,7 @@ certain elements, and working with and manipulating those elements.
     page.has_css?('table tr.foo')
     page.has_content?('foo')
 
-You can use with RSpecs magic matchers:
+You can these use with RSpec's magic matchers:
 
     page.should have_xpath('//table/tr')
     page.should have_css('table tr.foo')

lib/capybara/node.rb

@@ -22,7 +22,7 @@ module Capybara
   #     session.fill_in('Foo', :with => 'Bar')    # from Capybara::Node::Actions
   #     bar = session.locate('#bar')              # from Capybara::Node::Finders
   #     bar.select('Baz', :from => 'Quox')        # from Capybara::Node::Actions
-  #     session.has_css('#foobar')                # from Capybara::Node::Matchers
+  #     session.has_css?('#foobar')               # from Capybara::Node::Matchers
   #
   class Node
     attr_reader :session, :base