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

[Leo Koppelkamm]

Before & after
![screen shot 2013-05-12 at 15 56 05](https://f.cloud.github.com/assets/183302/492983/4c4ea8d4-bb0c-11e2-8de0-ffd0c346cebd.png)

You can merge this Pull Request by running:

  git pull https://github.com/DieBuche/openstreetmap-website overlapping

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/273

-- Commit Summary --

  * Fix overlapping text in markdown help

-- File Changes --

    M app/assets/stylesheets/common.css.scss (19)
    M app/views/site/_markdown_help.html.erb (22)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/273.patch
https://github.com/openstreetmap/openstreetmap-website/pull/273.diff

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