Update user_management.md

add rails_env to commands
move env to end of lines
Adding ability to configure webhook timeout via gitlab.yml
Merge pull request #7749 from wesgurn/master

Adding ability to configure webhook timeout via gitlab.yml
Merge pull request #7528 from exromany/patch-1

Update user_management.md
Fix grammatical error in 'not merged changes' msg
Merge pull request #7753 from tamers/patch-1

Fix grammatical error in 'not merged changes' msg