RFC: fix typos in README file

[Richard Bair]

>> Its all rather embarrassing, but we'll get it sorted. The Danno / Tom
>> solution of having a bitbucket repo and filing a JIRA with a link to
>> the patch has been working really well and then I can apply the patch
>> in the interim.
> 
> I'll try this with the next patch, if this is easier for you than the
> webrev thing. I'm not that happy to use external tools, especially ones
> that require logins and click through, but being an interim solution
> that's not a big deal, beside, not everyone has access to cr.openjdk or
> similar web space.

Webrev is fine if you're already setup to use it.

Cheers
Richard