Fix paths to the Contents Markdown pages

doc/api/README.md

@@ -69,15 +69,15 @@ When listing resources you can pass the following parameters:
 
 ## Contents
 
-+ [Users](doc/api/users.md)
-+ [Session](doc/api/session.md)
-+ [Projects](doc/api/projects.md)
-+ [Project Snippets](doc/api/project_snippets.md)
-+ [Repositories](doc/api/repositories.md)
-+ [Issues](doc/api/issues.md)
-+ [Milestones](doc/api/milestones.md)
-+ [Notes](doc/api/notes.md)
-+ [Deploy Keys](doc/api/deploy_keys.md)
-+ [System Hooks](doc/api/system_hooks.md)
-+ [Groups](doc/api/groups.md)
-+ [User Teams](doc/api/user_teams.md)
++ [Users](users.md)
++ [Session](session.md)
++ [Projects](projects.md)
++ [Project Snippets](project_snippets.md)
++ [Repositories](repositories.md)
++ [Issues](issues.md)
++ [Milestones](milestones.md)
++ [Notes](notes.md)
++ [Deploy Keys](deploy_keys.md)
++ [System Hooks](system_hooks.md)
++ [Groups](groups.md)
++ [User Teams](user_teams.md)