Fix anchors links in maven page
What does this MR do?
From the output of: https://gitlab.com/gitlab-com/gitlab-docs/merge_requests/397, I learned some links in this EE-only page were broken.
This fixes that.
Related issues
Relates to: https://gitlab.com/gitlab-com/gitlab-docs/merge_requests/397.
Author's checklist
Review checklist
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Technical writer's review (required)
Edited by Evan Read