Updated documentation: closed code snippet to be correctly rendered online (#288)

Author: symphony-soufiane

docsrc/markdown/health_service.md

@@ -23,3 +23,4 @@ class HealthMain:
 
 if __name__ == "__main__":
     asyncio.run(HealthMain.run())
+```

docsrc/markdown/session_service.md

@@ -20,4 +20,5 @@ class SessionMain:
 
 
 if __name__ == "__main__":
-    asyncio.run(SessionMain.run())
+    asyncio.run(SessionMain.run())
+```

docsrc/markdown/user_service.md

@@ -49,4 +49,5 @@ class UsersMain:
 
 
 if __name__ == "__main__":
-    asyncio.run(UsersMain.run())
+    asyncio.run(UsersMain.run())
+```