Fix typos in GitLab Maven Repository docs

What does this MR do?

Fixes typos in GitLab Maven Repository docs introduced in !23858 (merged).

Related issues

!23858 (merged)

Author's checklist

• Follow the Documentation Guidelines and Style Guide.
• [n/a] If applicable, update the permissions table.
• [n/a] Link docs to and from the higher-level index page, plus other related docs where helpful.
• Apply the documentation label.