[openstreetmap-website] Fixed wikipedia link reference to specific sections (#712)

[Tom Hughes]

Merged as 18734786a1845f6be18e6a52712a6a914638fb91. I also wrote some tests as 109dcfff196708f94179ed4c621a2e6d405b7118.

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https://github.com/openstreetmap/openstreetmap-website/pull/712#issuecomment-36409157
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