hotfix: some documentation, no code

src/processor/processor_tracker.cpp

@@ -87,7 +87,7 @@ void ProcessorTracker::processCapture(CaptureBasePtr _incoming_ptr)
 
             // Process info
             // TrackerFeature:  We only process new features in Last, here last = nullptr, so we do not have anything to do.
-            // TrackerLandmark: If we have given a map, all landmarks in the map are know. Process them.
+            // TrackerLandmark: If we have been given a map, all landmarks in the map are known. Process them.
             processKnown();
 
             // Update pointers