WIP: Document usage of services
What does this MR do?
This adds documentation on when and how to use services in GitLab-rails
Author's checklist
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Apply the correct labels and milestone -
Crosslink the document from the higher-level index -
Crosslink the document from other subject-related docs
Review checklist
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Your team's review (required) -
PM's review (recommended, but not a blocker) -
Technical writer's review (required) -
Merge the EE-MR first, CE-MR afterwards
Edited by Bob Van Landuyt