[openstreetmap/openstreetmap-website] Fix link to FAQ (PR #7055)

[Sarah Hoffmann]

### Description

The FAQ is in the root directory, not in /doc.

### How has this been tested?

Doc change only.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/7055

-- Commit Summary --

  * fix link to FAQ

-- File Changes --

    M CONTRIBUTING.md (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/7055.patchhttps://github.com/openstreetmap/openstreetmap-website/pull/7055.diff
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