Needed because of !2782.

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Fixes routing errors for /api/v3/projects/

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Closes https://github.com/gitlabhq/gitlabhq/issues/9904

The init script is already being updated in section 6.

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Update 8.0-to-8.1 update guide

- User needs to update gitlab-git-http-server
- User needs to update Nginx configuration

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See merge request !1625

Also adds a preamble note that a working 8.0 installation (i.e.,
gitlab-git-http-server, updated Nginx/Apache configs) is required before
proceeding.

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Closes #2837