[CentOS-docs] Typo on "TipsAndTricks/VncHeadlessInstall" wiki page

[Ralph Angenendt]

Timothy Lee wrote:
>     The first thing you will need is one of the ISO's from the CentOS

While I was at it, I corrected all "ISO's" in that text. 

<http://angryflower.com/bobsqu.gif>!

Ralph
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