[openstreetmap-website] Fix overlapping text in markdown help (#273)

[Saman Bemel-Benrud]

This looks fine - I only checked english so didn't forsee this problem. I think you're good to merge.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/273#issuecomment-19218881
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