update installation docs branches for source installations
What does this MR do?
Updates the branches for the installation docs with the 11-2-stable
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Does this MR meet the acceptance criteria?
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Documentation created/updated - Conforms to the code review guidelines
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Has been reviewed by a Backend maintainer(https://docs.gitlab.com/ee/development/merge_request_performance_guidelines.html)
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Conforms to the style guides
Related to: gitlab-org/release/tasks#377 (closed)
Edited by Jose Ivan Vargas