[openstreetmap-website] Add some text and links wrt trademarks to the copyright page (#973)

[simonpoole]

It has been suggested that ® "circle-R" might be better than superscript TM

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/973#issuecomment-102419448
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