typo changes

actionmailer/README.rdoc

@@ -75,7 +75,7 @@ Or you can just chain the methods together like:
 == Receiving emails
 
 To receive emails, you need to implement a public instance method called <tt>receive</tt> that takes a
-tmail object as its single parameter. The Action Mailer framework has a corresponding class method,
+email object as its single parameter. The Action Mailer framework has a corresponding class method,
 which is also called <tt>receive</tt>, that accepts a raw, unprocessed email as a string, which it then turns
 into the tmail object and calls the receive instance method.
 
@@ -145,3 +145,4 @@ API documentation is at
 Bug reports and feature requests can be filed with the rest for the Ruby on Rails project here:
 
 * https://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets
+