Fix typo in inline code snippet

[benjy]

What is the purpose of this pull request?

Typo fix

[msamsel]

Hi @benjy,
thank you very much for your contribution. We still need for your CLA signature to have possibility to merge your changes with CKEditor. :) I hope it won't be a problem in this case.

[benjy]

Sure, are you emailing the details?

[mlewand]

@benjy CLA could not be sent because you have masked email. Please either:

• Share your email address through our contact form (use inquire type "other" and link to this PR).
• Unmask your email.

Choose whatever works better for you. Sorry for so much hassle for such a small change... 😉

[benjy]

I've signed the document, it was a little convoluted, a bit of political correctness gone mad I think!

[mlewand]

Thanks for the contribution @benjy. Sorry for the formal part, but we simply need them for accepting any work. And clearly our CLA system needs a better handling for masked mails, as it's not uncommon to use it (I'm using it myself 😉).