Alphabetize Development doc index

[ci skip]

doc/development/README.md

 # Development
 
 - [Architecture](architecture.md) of GitLab
-- [Shell commands](shell_commands.md) in the GitLab codebase
-- [Rake tasks](rake_tasks.md) for development
+- [Benchmarking](benchmarking.md)
 - [CI setup](ci_setup.md) for testing GitLab
+- [How to dump production data to staging](dump_db.md)
+- [Migration Style Guide](migration_style_guide.md) for creating safe migrations
+- [Rake tasks](rake_tasks.md) for development
+- [Shell commands](shell_commands.md) in the GitLab codebase
 - [Sidekiq debugging](sidekiq_debugging.md)
 - [UI guide](ui_guide.md) for building GitLab with existing css styles and elements
-- [Migration Style Guide](migration_style_guide.md) for creating safe migrations
-- [How to dump production data to staging](dump_db.md)
-- [Benchmarking](benchmarking.md)