Overview and use cases for repo limit

Marcia Ramosrequested to merge
docs/add-features-limit-size into master

See the general Documentation guidelines http://docs.gitlab.com/ce/development/doc_styleguide.html

What does this MR do?

Adds overview and use cases for repo limit size

For https://gitlab.com/gitlab-org/gitlab-ee/issues/2703

Edited by Marcia Ramos

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