fix building.md

Author: knopers8

docs/building.md

@@ -88,5 +88,3 @@ For subsequent builds (after the first one), plain `make` (instead of `make all`
 If you wish to also build the process control library and/or plugin, see [the OCC readme](./occ/README.md).
 
 This build of AliECS can be run locally and connected to an existing O²/FLP Suite cluster by passing a `--mesosUrl` parameter. If you do this, remember to `systemctl stop o2-aliecs-core` on the head node, in order to stop the core that came with the O²/FLP Suite and use your own.
-
-[test](nonexistent.md#test)