Fixed typo in form docs

docs/patterns/wtforms.rst

@@ -23,7 +23,7 @@ This is an example form for a typical registration page::
         username = TextField('Username', [validators.Length(min=4, max=25)])
         email = TextField('Email Address', [validators.Length(min=6, max=35)])
         password = PasswordField('New Password', [Required(),
-            EqualTo('confirm', mesage='Passwords must match')])
+            EqualTo('confirm', message='Passwords must match')])
         confirm = PasswordField('Repeat Password')
         accept_tos = BooleanField('I accept the TOS', [validators.Required()])