CLEANUP: server: fix srv_set_{running, stopping, stopped} function comment

Fixing function comments for the server state changing function since they
still refer to asynchonous propagation of server state which is no longer
in play.
Moreover, there were some mixups between running/stopping.
diff --git a/src/server.c b/src/server.c
index ab73509..ff2832f 100644
--- a/src/server.c
+++ b/src/server.c
@@ -1581,10 +1581,9 @@
 	}
 }
 
-/* Marks server <s> down, regardless of its checks' statuses. The server is
- * registered in a list to postpone the counting of the remaining servers on
- * the proxy and transfers queued streams whenever possible to other servers at
- * a sync point. Maintenance servers are ignored.
+/* Marks server <s> down, regardless of its checks' statuses. The server
+ * transfers queued streams whenever possible to other servers at a sync
+ * point. Maintenance servers are ignored.
  *
  * Must be called with the server lock held.
  */
@@ -1609,9 +1608,8 @@
 }
 
 /* Marks server <s> up regardless of its checks' statuses and provided it isn't
- * in maintenance. The server is registered in a list to postpone the counting
- * of the remaining servers on the proxy and tries to grab requests from the
- * proxy at a sync point. Maintenance servers are ignored.
+ * in maintenance. The server tries to grab requests from the proxy at a sync
+ * point. Maintenance servers are ignored.
  *
  * Must be called with the server lock held.
  */
@@ -1642,9 +1640,8 @@
 }
 
 /* Marks server <s> stopping regardless of its checks' statuses and provided it
- * isn't in maintenance. The server is registered in a list to postpone the
- * counting of the remaining servers on the proxy and tries to grab requests
- * from the proxy. Maintenance servers are ignored.
+ * isn't in maintenance. The server tries to redispatch pending requests
+ * to the proxy. Maintenance servers are ignored.
  *
  * Must be called with the server lock held.
  */