This is a deleted link: -[http://jira.atlassian.com]-
The reason why you need to add [ and ] around your url is that the trailing minus sign is considered to be a part of the url (it's a valid character for an url), so wiki sees your text as "-URL" and not "-URL-" and that's why it doesn't properly strike it out.
Mmm, if you're goint to edit the question, then it's worth commenting to tell us you've done it, and explain why answers and comments suddenly don't make sense.
You do not mean "deleted", you mean "struck out" and all you need to do to format your text is click the "help" link underneath the text box to find out how to use the markup.
Sometimes though, if you add and delete spaces and other text, Jira can get confused and not save quite what you expect (which then messes up the formatting). Try removing and then re-typing or re-pasting the raw text. If that doesn't help, then try putting spaces in between the url and the - signs
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