Fixed MagicScore page

I fixed the MagicScore page.
In the document I copied, I used arrow brackets for special keys (eg., Ctrl), and when I copied them to blogger, they were interpreted as HTML tags.

Just occurred to me I should have tried the copy in the Compose mode, I might not have needed to change them to square brackets. When I have time to spare, I'll have to try that.

I hope to get some illustrations added later.

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