Merge branch 'docs-redirects1-ee' into 'master'

Docs: Add missing redirects to /workflow and /articles docs (Only EE Docs)

Closes gitlab-com/gitlab-docs#349

See merge request gitlab-org/gitlab-ee!9872

doc/articles/how_to_configure_ldap_gitlab_ee/index.md

+---
+redirect_to: '../../administration/auth/how_to_configure_ldap_gitlab_ee/index.md'
+---
+
 This document was moved to [another location](../../administration/auth/how_to_configure_ldap_gitlab_ee/index.md).

doc/workflow/ff_merge.md

+---
+redirect_to: '../user/project/merge_requests/fast_forward_merge.md'
+---
+
 This document was moved to [user/project/merge_requests/fast_forward_merge](../user/project/merge_requests/fast_forward_merge.md).

doc/workflow/git_lfs.md

+---
+redirect_to: 'lfs/manage_large_binaries_with_git_lfs.md'
+---
+
 This document was moved to [another location](lfs/manage_large_binaries_with_git_lfs.md).

doc/workflow/merge_request_approvals.md

+---
+redirect_to: '../user/project/merge_requests/merge_request_approvals.md'
+---
+
 This document was moved to [user/project/merge_requests/merge_request_approvals](../user/project/merge_requests/merge_request_approvals.md).

doc/workflow/rebase_before_merge.md

+---
+redirect_to: '../user/project/merge_requests/fast_forward_merge.md'
+---
+
 This document was moved to [another location](../user/project/merge_requests/fast_forward_merge.md).